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News for the tz database 
 
Release 2018e - 2018-05-01 23:42:51 -0700 
 
  Briefly: 
 
    North Korea switches back to +09 on 2018-05-05. 
    The main format uses negative DST again, for Ireland etc. 
    'make tarballs' now also builds a rearguard tarball. 
    New 's' and 'd' suffixes in SAVE columns of Rule and Zone lines. 
 
  Changes to past and future time stamps 
 
    North Korea switches back from +0830 to +09 on 2018-05-05. 
    (Thanks to Kang Seonghoon, Arthur David Olson, Seo Sanghyeon, 
    and Tim Parenti.) 
 
    Bring back the negative-DST changes of 2018a, except be more 
    compatible with data parsers that do not support negative DST. 
    Also, this now affects historical time stamps in Namibia and the 
    former Czechoslovakia, not just Ireland.  The main format now uses 
    negative DST to model time stamps in Europe/Dublin (from 1971 on), 
    Europe/Prague (1946/7), and Africa/Windhoek (1994/2017).  This 
    does not affect UT offsets, only time zone abbreviations and the 
    tm_isdst flag.  Also, this does not affect rearguard or vanguard 
    formats; effectively the main format now uses vanguard instead of 
    rearguard format.  Data parsers that do not support negative DST 
    can still use data from the rearguard tarball described below. 
 
  Changes to build procedure 
 
    The command 'make tarballs' now also builds the tarball 
    tzdataVERSION-rearguard.tar.gz, which is like tzdataVERSION.tar.gz 
    except that it uses rearguard format intended for trailing-edge 
    data parsers. 
 
  Changes to data format and to code 
 
    The SAVE column of Rule and Zone lines can now have an 's' or 'd' 
    suffix, which specifies whether the adjusted time is standard time 
    or daylight saving time.  If no suffix is given, daylight saving 
    time is used if and only if the SAVE column is nonzero; this is 
    the longstanding behavior.  Although this new feature is not used 
    in tzdata, it could be used to specify the legal time in Namibia 
    1994-2017, as opposed to the popular time (see below). 
 
  Changes to past time stamps 
 
    From 1994 through 2017 Namibia observed DST in winter, not summer. 
    That is, it used negative DST, as Ireland still does.  This change 
    does not affect UTC offsets; it affects only the tm_isdst flag and 
    the abbreviation used during summer, which is now CAT, not WAST. 
    Although (as noted by Michael Deckers) summer and winter time were 
    both simply called "standard time" in Namibian law, in common 
    practice winter time was considered to be DST (as noted by Stephen 
    Colebourne).  The full effect of this change is only in vanguard 
    format; in rearguard and main format, the tm_isdst flag is still 
    zero in winter and nonzero in summer. 
 
    In 1946/7 Czechoslovakia also observed negative DST in winter. 
    The full effect of this change is only in vanguard format; in 
    rearguard and main formats, it is modeled as plain GMT without 
    daylight saving.  Also, the dates of some 1944/5 DST transitions 
    in Czechoslovakia have been changed. 
 
 
Release 2018d - 2018-03-22 07:05:46 -0700 
 
  Briefly: 
 
  Palestine starts DST a week earlier in 2018. 
  Add support for vanguard and rearguard data consumers. 
  Add subsecond precision to source data format, though not to data. 
 
  Changes to future time stamps 
 
    In 2018, Palestine starts DST on March 24, not March 31. 
    Adjust future predictions accordingly.  (Thanks to Sharef Mustafa.) 
 
  Changes to past and future time stamps 
 
    Casey Station in Antarctica changed from +11 to +08 on 2018-03-11 
    at 04:00.  (Thanks to Steffen Thorsen.) 
 
  Changes to past time stamps 
 
    Historical transitions for Uruguay, represented by 
    America/Montevideo, have been updated per official legal documents, 
    replacing previous data mainly originating from the inventions of 
    Shanks & Pottenger.  This has resulted in adjustments ranging from 
    30 to 90 minutes in either direction over at least two dozen 
    distinct periods ranging from one day to several years in length. 
    A mere handful of pre-1991 transitions are unaffected; data since 
    then has come from more reliable contemporaneous reporting.  These 
    changes affect various timestamps in 1920-1923, 1936, 1939, 
    1942-1943, 1959, 1966-1970, 1972, 1974-1980, and 1988-1990. 
    Additionally, Uruguay's pre-standard-time UT offset has been 
    adjusted westward by 7 seconds, from UT-03:44:44 to UT-03:44:51, to 
    match the location of the Observatory of the National Meteorological 
    Institute in Montevideo. 
    (Thanks to Jeremie Bonjour, Tim Parenti, and Michael Deckers.) 
 
    Enderbury and Kiritimati skipped New Year's Eve 1994, not 
    New Year's Day 1995.  (Thanks to Kerry Shetline.) 
 
    Fix the 1912-01-01 transition for Portugal and its colonies. 
    This transition was at 00:00 according to the new UT offset, not 
    according to the old one.  Also assume that Cape Verde switched on 
    the same date as the rest, not in 1907.  This affects 
    Africa/Bissau, Africa/Sao_Tome, Asia/Macau, Atlantic/Azores, 
    Atlantic/Cape_Verde, Atlantic/Madeira, and Europe/Lisbon. 
    (Thanks to Michael Deckers.) 
 
    Fix an off-by-1 error for pre-1913 timestamps in Jamaica and in 
    Turks & Caicos. 
 
  Changes to past time zone abbreviations 
 
    MMT took effect in Uruguay from 1908-06-10, not 1898-06-28.  There 
    is no clock change associated with the transition. 
 
  Changes to build procedure 
 
    The new DATAFORM macro in the Makefile lets the installer choose 
    among three source data formats.  The idea is to lessen downstream 
    disruption when data formats are improved. 
 
    * DATAFORM=vanguard installs from the latest, bleeding-edge 
      format.  DATAFORM=main (the default) installs from the format 
      used in the 'africa' etc. files.  DATAFORM=rearguard installs 
      from a trailing-edge format.  Eventually, elements of today's 
      vanguard format should move to the main format, and similarly 
      the main format's features should eventually move to the 
      rearguard format. 
 
    * In the current version, the main and rearguard formats are 
      identical and match that of 2018c, so this change does not 
      affect default behavior.  The vanguard format currently contains 
      one feature not in the main format: negative SAVE values.  This 
      improves support for Ireland, which uses Irish Standard Time 
      (IST, UTC+01) in summer and GMT (UTC) in winter.  tzcode has 
      supported negative SAVE values for decades, and this feature 
      should move to the main format soon.  However, it will not move 
      to the rearguard format for quite some time because some 
      downstream parsers do not support it. 
 
    * The build procedure constructs three files vanguard.zi, main.zi, 
      and rearguard.zi, one for each format.  The files represent the 
      same data as closely as the formats allow.  These three files 
      are intended for downstream data consumers and are not 
      installed.  Zoneinfo parsers that do not support negative SAVE values 
      should start using rearguard.zi, so that they will be unaffected 
      when the negative-DST feature moves from vanguard to main. 
      Bleeding-edge Zoneinfo parsers that support the new features 
      already can use vanguard.zi; in this respect, current tzcode is 
      bleeding-edge. 
 
    The Makefile should now be safe for parallelized builds, and 'make 
    -j to2050new.tzs' is now much faster on a multiprocessor host 
    with GNU Make. 
 
    When built with -DSUPPRESS_TZDIR, the tzcode library no longer 
    prepends TZDIR/ to file names that do not begin with '/'.  This is 
    not recommended for general use, due to its security implications. 
    (From a suggestion by Manuela Friedrich.) 
 
  Changes to code 
 
    zic now accepts subsecond precision in expressions like 
    00:19:32.13, which is approximately the legal time of the 
    Netherlands from 1835 to 1937.  However, because it is 
    questionable whether the few recorded uses of non-integer offsets 
    had subsecond precision in practice, there are no plans for tzdata 
    to use this feature.  (Thanks to Steve Allen for pointing out 
    the limitations of historical data in this area.) 
 
    The code is a bit more portable to MS-Windows.  Installers can 
    compile with -DRESERVE_STD_EXT_IDS on MS-Windows platforms that 
    reserve identifiers like 'localtime'.  (Thanks to Manuela 
    Friedrich). 
 
  Changes to documentation and commentary 
 
    theory.html now outlines tzdb's extensions to POSIX's model for 
    civil time, and has a section "POSIX features no longer needed" 
    that lists POSIX API components that are now vestigial. 
    (From suggestions by Steve Summit.)  It also better distinguishes 
    time zones from tz regions.  (From a suggestion by Guy Harris.) 
 
    Commentary is now more consistent about using the phrase "daylight 
    saving time", to match the C name tm_isdst.  Daylight saving time 
    need not occur in summer, and need not have a positive offset from 
    standard time. 
 
    Commentary about historical transitions in Uruguay has been expanded 
    with links to many relevant legal documents. 
    (Thanks to Tim Parenti.) 
 
    Commentary now uses some non-ASCII characters with Unicode value 
    less than U+0100, as they can be useful and should work even with 
    older editors such as XEmacs. 
 
 
Release 2018c - 2018-01-22 23:00:44 -0800 
 
  Briefly: 
  Revert Irish changes that relied on negative SAVE values. 
 
  Changes to tm_isdst 
 
    Revert the 2018a change to Europe/Dublin.  As before, this change 
    does not affect UT offsets or abbreviations; it affects only 
    whether timestamps are considered to be standard time or 
    daylight-saving time, as expressed in the tm_isdst flag of C's 
    struct tm type.  This reversion is intended to be a temporary 
    workaround for problems discovered with downstream uses of 
    releases 2018a and 2018b, which implemented Irish time by using 
    negative SAVE values in the Eire rules of the 'europe' file. 
    Although negative SAVE values have been part of tzcode for many 
    years and are supported by many platforms, they were not 
    documented before 2018a and ICU and OpenJDK do not currently 
    support them.  A mechanism to export data to platforms lacking 
    support for negative DST is planned to be developed before the 
    change is reapplied.  (Problems reported by Deborah Goldsmith and 
    Stephen Colebourne.) 
 
  Changes to past time stamps 
 
    Japanese DST transitions (1948-1951) were Sundays at 00:00, not 
    Saturdays or Sundays at 02:00.  (Thanks to Takayuki Nikai.) 
 
  Changes to build procedure 
 
    The build procedure now works around mawk 1.3.3's lack of support 
    for character class expressions.  (Problem reported by Ohyama.) 
 
 
Release 2018b - 2018-01-17 23:24:48 -0800 
 
  Briefly: 
  Fix a packaging problem in tz2018a, which was missing 'pacificnew'. 
 
  Changes to build procedure 
 
    The distribution now contains the file 'pacificnew' again. 
    This file was inadvertantly omitted in the 2018a distribution. 
    (Problem reported by Matias Fonzo.) 
 
 
Release 2018a - 2018-01-12 22:29:21 -0800 
 
  Briefly: 
  São Tomé and Príncipe switched from +00 to +01. 
  Brazil's DST will now start on November's first Sunday. 
  Ireland's standard time is now in the summer, not the winter. 
  Use Debian-style installation locations, instead of 4.3BSD-style. 
  New zic option -t. 
 
  Changes to past and future time stamps 
 
    São Tomé and Príncipe switched from +00 to +01 on 2018-01-01 at 
    01:00.  (Thanks to Steffen Thorsen and Michael Deckers.) 
 
  Changes to future time stamps 
 
    Starting in 2018 southern Brazil will begin DST on November's 
    first Sunday instead of October's third Sunday.  (Thanks to 
    Steffen Thorsen.) 
 
  Changes to past time stamps 
 
    A discrepancy of 4 s in timestamps before 1931 in South Sudan has 
    been corrected.  The 'backzone' and 'zone.tab' files did not agree 
    with the 'africa' and 'zone1970.tab' files.  (Problem reported by 
    Michael Deckers.) 
 
    The abbreviation invented for Bolivia Summer Time (1931-2) is now 
    BST instead of BOST, to be more consistent with the convention 
    used for Latvian Summer Time (1918-9) and for British Summer Time. 
 
  Changes to tm_isdst 
 
    Change Europe/Dublin so that it observes Irish Standard Time (UT 
    +01) in summer and GMT (as negative daylight-saving) in winter, 
    instead of observing standard time (GMT) in winter and Irish 
    Summer Time (UT +01) in summer.  This change does not affect UT 
    offsets or abbreviations; it affects only whether timestamps are 
    considered to be standard time or daylight-saving time, as 
    expressed in the tm_isdst flag of C's struct tm type. 
    (Discrepancy noted by Derick Rethans.) 
 
  Changes to build procedure 
 
    The default installation locations have been changed to mostly 
    match Debian circa 2017, instead of being designed as an add-on to 
    4.3BSD circa 1986.  This affects the Makefile macros TOPDIR, 
    TZDIR, MANDIR, and LIBDIR.  New Makefile macros TZDEFAULT, USRDIR, 
    USRSHAREDIR, BINDIR, ZDUMPDIR, and ZICDIR let installers tailor 
    locations more precisely.  (This responds to suggestions from 
    Brian Inglis and from Steve Summit.) 
 
    The default installation procedure no longer creates the 
    backward-compatibility link US/Pacific-New, which causes 
    confusion during user setup (e.g., see Debian bug 815200). 
    Use 'make BACKWARD="backward pacificnew"' to create the link 
    anyway, for now.  Eventually we plan to remove the link entirely. 
 
    tzdata.zi now contains a version-number comment. 
    (Suggested by Tom Lane.) 
 
    The Makefile now quotes values like BACKWARD more carefully when 
    passing them to the shell.  (Problem reported by Zefram.) 
 
    Builders no longer need to specify -DHAVE_SNPRINTF on platforms 
    that have snprintf and use pre-C99 compilers.  (Problem reported 
    by Jon Skeet.) 
 
  Changes to code 
 
    zic has a new option -t FILE that specifies the location of the 
    file that determines local time when TZ is unset.  The default for 
    this location can be configured via the new TZDEFAULT makefile 
    macro, which defaults to /etc/localtime. 
 
    Diagnostics and commentary now distinguish UT from UTC more 
    carefully; see theory.html for more information about UT vs UTC. 
 
    zic has been ported to GCC 8's -Wstringop-truncation option. 
    (Problem reported by Martin Sebor.) 
 
  Changes to documentation and commentary 
 
    The zic man page now documents the longstanding behavior that 
    times and years can be out of the usual range, with negative times 
    counting backwards from midnight and with year 0 preceding year 1. 
    (Problem reported by Michael Deckers.) 
 
    The theory.html file now mentions the POSIX limit of six chars 
    per abbreviation, and lists alphabetic abbreviations used. 
 
    The files tz-art.htm and tz-link.htm have been renamed to 
    tz-art.html and tz-link.html, respectively, for consistency with 
    other file names and to simplify web server configuration. 
 
 
Release 2017c - 2017-10-20 14:49:34 -0700 
 
  Briefly: 
  Northern Cyprus switches from +03 to +02/+03 on 2017-10-29. 
  Fiji ends DST 2018-01-14, not 2018-01-21. 
  Namibia switches from +01/+02 to +02 on 2018-04-01. 
  Sudan switches from +03 to +02 on 2017-11-01. 
  Tonga likely switches from +13/+14 to +13 on 2017-11-05. 
  Turks & Caicos switches from -04 to -05/-04 on 2018-11-04. 
  A new file tzdata.zi now holds a small text copy of all data. 
  The zic input format has been regularized slightly. 
 
  Changes to future time stamps 
 
    Northern Cyprus has decided to resume EU rules starting 
    2017-10-29, thus reinstituting winter time. 
 
    Fiji ends DST 2018-01-14 instead of the 2018-01-21 previously 
    predicted.  (Thanks to Dominic Fok.)  Adjust future predictions 
    accordingly. 
 
    Namibia will switch from +01 with DST to +02 all year on 
    2017-09-03 at 02:00.  This affects UT offsets starting 2018-04-01 
    at 02:00.  (Thanks to Steffen Thorsen.) 
 
    Sudan will switch from +03 to +02 on 2017-11-01.  (Thanks to Ahmed 
    Atyya and Yahia Abdalla.)  South Sudan is not switching, so 
    Africa/Juba is no longer a link to Africa/Khartoum. 
 
    Tonga has likely ended its experiment with DST, and will not 
    adjust its clocks on 2017-11-05.  Although Tonga has not announced 
    whether it will continue to observe DST, the IATA is assuming that 
    it will not.  (Thanks to David Wade.) 
 
    Turks & Caicos will switch from -04 all year to -05 with US DST on 
    2018-03-11 at 03:00.  This affects UT offsets starting 2018-11-04 
    at 02:00.  (Thanks to Steffen Thorsen.) 
 
  Changes to past time stamps 
 
    Namibia switched from +02 to +01 on 1994-03-21, not 1994-04-03. 
    (Thanks to Arthur David Olson.) 
 
    Detroit did not observe DST in 1967. 
 
    Use railway time for Asia/Kolkata before 1941, by switching to 
    Madras local time (UT +052110) in 1870, then to IST (UT +0530) in 
    1906.  Also, treat 1941-2's +0630 as DST, like 1942-5. 
 
    Europe/Dublin's 1946 and 1947 fallback transitions occurred at 
    02:00 standard time, not 02:00 DST.  (Thanks to Michael Deckers.) 
 
    Pacific/Apia and Pacific/Pago_Pago switched from Antipodean to 
    American time in 1892, not 1879.  (Thanks to Michael Deckers.) 
 
    Adjust the 1867 transition in Alaska to better reflect the 
    historical record, by changing it to occur on 1867-10-18 at 15:30 
    Sitka time rather than at the start of 1867-10-17 local time. 
    Although strictly speaking this is accurate only for Sitka, 
    the rest of Alaska's blanks need to be filled in somehow. 
 
    Fix off-by-one errors in UT offsets for Adak and Nome before 1867. 
    (Thanks to Michael Deckers.) 
 
    Add 7 s to the UT offset in Asia/Yangon before 1920. 
 
  Changes to zone names 
 
    Remove Canada/East-Saskatchewan from the 'backward' file, as it 
    exceeded the 14-character limit and was an unused misnomer anyway. 
 
  Changes to build procedure 
 
    To support applications that prefer to read time zone data in text 
    form, two zic input files tzdata.zi and leapseconds are now 
    installed by default.  The commands 'zic tzdata.zi' and 'zic -L 
    leapseconds tzdata.zi' can reproduce the tzdata binary files 
    without and with leap seconds, respectively.  To prevent these two 
    new files from being installed, use 'make TZDATA_TEXT=', and to 
    suppress leap seconds from the tzdata text installation, use 'make 
    TZDATA_TEXT=tzdata.zi'. 
 
    'make BACKWARD=' now suppresses backward-compatibility names 
    like 'US/Pacific' that are defined in the 'backward' and 
    'pacificnew' files. 
 
    'make check' now works on systems that lack a UTF-8 locale, 
    or that lack the nsgmls program.  Set UTF8_LOCALE to configure 
    the name of a UTF-8 locale, if you have one. 
 
    Y2K runtime checks are no longer enabled by default.  Add 
    -DDEPRECATE_TWO_DIGIT_YEARS to CFLAGS to enable them, instead of 
    adding -DNO_RUN_TIME_WARNINGS_ABOUT_YEAR_2000_PROBLEMS_THANK_YOU 
    to disable them.  (New name suggested by Brian Inglis.) 
 
    The build procedure for zdump now works on AIX 7.1. 
    (Problem reported by Kees Dekker.) 
 
  Changes to code 
 
    zic and the reference runtime now reject multiple leap seconds 
    within 28 days of each other, or leap seconds before the Epoch. 
    As a result, support for double leap seconds, which was 
    obsolescent and undocumented, has been removed.  Double leap 
    seconds were an error in the C89 standard; they have never existed 
    in civil timekeeping.  (Thanks to Robert Elz and Bradley White for 
    noticing glitches in the code that uncovered this problem.) 
 
    zic now warns about use of the obsolescent and undocumented -y 
    option, and about use of the obsolescent TYPE field of Rule lines. 
 
    zic now allows unambiguous abbreviations like "Sa" and "Su" for 
    weekdays; formerly it rejected them due to a bug.  Conversely, zic 
    no longer considers non-prefixes to be abbreviations; for example, 
    it no longer accepts "lF" as an abbreviation for "lastFriday". 
    Also, zic warns about the undocumented usage with a "last-" 
    prefix, e.g., "last-Fri". 
 
    Similarly, zic now accepts the unambiguous abbreviation "L" for 
    "Link" in ordinary context and for "Leap" in leap-second context. 
    Conversely, zic no longer accepts non-prefixes such as "La" as 
    abbreviations for words like "Leap". 
 
    zic no longer accepts leap second lines in ordinary input, or 
    ordinary lines in leap second input.  Formerly, zic sometimes 
    warned about this undocumented usage and handled it incorrectly. 
 
    The new macro HAVE_TZNAME governs whether the tzname external 
    variable is exported, instead of USG_COMPAT.  USG_COMPAT now 
    governs only the external variables "timezone" and "daylight". 
    This change is needed because the three variables are not in the 
    same category: although POSIX requires tzname, it specifies the 
    other two variables as optional.  Also, USG_COMPAT is now 1 or 0: 
    if not defined, the code attempts to guess it from other macros. 
 
    localtime.c and difftime.c no longer require stdio.h, and .c files 
    other than zic.c no longer require sys/wait.h. 
 
    zdump.c no longer assumes snprintf.  (Reported by Jonathan Leffler.) 
 
    Calculation of time_t extrema works around a bug in GCC 4.8.4 
    (Reported by Stan Shebs and Joseph Myers.) 
 
    zic.c no longer mistranslates formats of line numbers in non-English 
    locales.  (Problem reported by Benno Schulenberg.) 
 
    Several minor changes have been made to the code to make it a 
    bit easier to port to MS-Windows and Solaris.  (Thanks to Kees 
    Dekker for reporting the problems.) 
 
  Changes to documentation and commentary 
 
    The two new files 'theory.html' and 'calendars' contain the 
    contents of the removed file 'Theory'.  The goal is to document 
    tzdb theory more accessibly. 
 
    The zic man page now documents abbreviation rules. 
 
    tz-link.htm now covers how to apply tzdata changes to clients. 
    (Thanks to Jorge Fábregas for the AIX link.)  It also mentions MySQL. 
 
    The leap-seconds.list URL has been updated to something that is 
    more reliable for tzdb.  (Thanks to Tim Parenti and Brian Inglis.) 
 
Release 2017b - 2017-03-17 07:30:38 -0700 
 
  Briefly: Haiti has resumed DST. 
 
  Changes to past and future time stamps 
 
    Haiti resumed observance of DST in 2017.  (Thanks to Steffen Thorsen.) 
 
  Changes to past time stamps 
 
    Liberia changed from -004430 to +00 on 1972-01-07, not 1972-05-01. 
 
    Use "MMT" to abbreviate Liberia's time zone before 1972, as "-004430" 
    is one byte over the POSIX limit.  (Problem reported by Derick Rethans.) 
 
  Changes to code 
 
    The reference localtime implementation now falls back on the 
    current US daylight-saving transition rules rather than the 
    1987-2006 rules.  This fallback occurs only when (1) the TZ 
    environment variable's value has a name like "AST4ADT" that asks 
    for daylight saving time but does not specify the rules, (2) there 
    is no file by that name, and (3) the TZDEFRULES file cannot be 
    loaded.  (Thanks to Tom Lane.) 
 
 
Release 2017a - 2017-02-28 00:05:36 -0800 
 
  Briefly: Southern Chile moves from -04/-03 to -03, and Mongolia 
  discontinues DST. 
 
  Changes to future time stamps 
 
    Mongolia no longer observes DST.  (Thanks to Ganbold Tsagaankhuu.) 
 
    Chile's Region of Magallanes moves from -04/-03 to -03 year-round. 
    Its clocks diverge from America/Santiago starting 2017-05-13 at 
    23:00, hiving off a new zone America/Punta_Arenas.  Although the 
    Chilean government says this change expires in May 2019, for now 
    assume it's permanent.  (Thanks to Juan Correa and Deborah 
    Goldsmith.)  This also affects Antarctica/Palmer. 
 
  Changes to past time stamps 
 
    Fix many entries for historical time stamps for Europe/Madrid 
    before 1979, to agree with tables compiled by Pere Planesas of the 
    National Astronomical Observatory of Spain.  As a side effect, 
    this changes some time stamps for Africa/Ceuta before 1929, which 
    are probably guesswork anyway.  (Thanks to Steve Allen and 
    Pierpaolo Bernardi for the heads-ups, and to Michael Deckers for 
    correcting the 1901 transition.) 
 
    Ecuador observed DST from 1992-11-28 to 1993-02-05. 
    (Thanks to Alois Treindl.) 
 
    Asia/Atyrau and Asia/Oral were at +03 (not +04) before 1930-06-21. 
    (Thanks to Stepan Golosunov.) 
 
  Changes to past and future time zone abbreviations 
 
    Switch to numeric time zone abbreviations for South America, as 
    part of the ongoing project of removing invented abbreviations. 
    This avoids the need to invent an abbreviation for the new Chilean 
    new zone.  Similarly, switch from invented to numeric time zone 
    abbreviations for Afghanistan, American Samoa, the Azores, 
    Bangladesh, Bhutan, the British Indian Ocean Territory, Brunei, 
    Cape Verde, Chatham Is, Christmas I, Cocos (Keeling) Is, Cook Is, 
    Dubai, East Timor, Eucla, Fiji, French Polynesia, Greenland, 
    Indochina, Iran, Iraq, Kiribati, Lord Howe, Macquarie, Malaysia, 
    the Maldives, Marshall Is, Mauritius, Micronesia, Mongolia, 
    Myanmar, Nauru, Nepal, New Caledonia, Niue, Norfolk I, Palau, 
    Papua New Guinea, the Philippines, Pitcairn, Qatar, Réunion, St 
    Pierre & Miquelon, Samoa, Saudi Arabia, Seychelles, Singapore, 
    Solomon Is, Tokelau, Tuvalu, Wake, Vanuatu, Wallis & Futuna, and 
    Xinjiang; for 20-minute daylight saving time in Ghana before 1943; 
    for half-hour daylight saving time in Belize before 1944 and in 
    the Dominican Republic before 1975; and for Canary Islands before 
    1946, for Guinea-Bissau before 1975, for Iceland before 1969, for 
    Indian Summer Time before 1942, for Indonesia before around 1964, 
    for Kenya before 1960, for Liberia before 1973, for Madeira before 
    1967, for Namibia before 1943, for the Netherlands in 1937-9, for 
    Pakistan before 1971, for Western Sahara before 1977, and for 
    Zaporozhye in 1880-1924. 
 
    For Alaska time from 1900 through 1967, instead of "CAT" use the 
    abbreviation "AST", the abbreviation commonly used at the time 
    (Atlantic Standard Time had not been standardized yet).  Use "AWT" 
    and "APT" instead of the invented abbreviations "CAWT" and "CAPT". 
 
    Use "CST" and "CDT" instead of invented abbreviations for Macau 
    before 1999 and Taiwan before 1938, and use "JST" instead of the 
    invented abbreviation "JCST" for Japan and Korea before 1938. 
 
  Change to database entry category 
 
    Move the Pacific/Johnston link from 'australasia' to 'backward', 
    since Johnston is now uninhabited. 
 
  Changes to code 
 
    zic no longer mishandles some transitions in January 2038 when it 
    attempts to work around Qt bug 53071.  This fixes a bug affecting 
    Pacific/Tongatapu that was introduced in zic 2016e.  localtime.c 
    now contains a workaround, useful when loading a file generated by 
    a buggy zic.  (Problem and localtime.c fix reported by Bradley 
    White.) 
 
    zdump -i now outputs non-hour numeric time zone abbreviations 
    without a colon, e.g., "+0530" rather than "+05:30".  This agrees 
    with zic %z and with common practice, and simplifies auditing of 
    zdump output. 
 
    zdump is now buildable again with -DUSE_LTZ=0. 
    (Problem reported by Joseph Myers.) 
 
    zdump.c now always includes private.h, to avoid code duplication 
    with private.h.  (Problem reported by Kees Dekker.) 
 
    localtime.c no longer mishandles early or late timestamps 
    when TZ is set to a POSIX-style string that specifies DST. 
    (Problem reported by Kees Dekker.) 
 
    date and strftime now cause %z to generate "-0000" instead of 
    "+0000" when the UT offset is zero and the time zone abbreviation 
    begins with "-". 
 
  Changes to documentation and commentary 
 
    The 'Theory' file now better documents choice of historical time 
    zone abbreviations.  (Problems reported by Michael Deckers.) 
 
    tz-link.htm now covers leap smearing, which is popular in clouds. 
 
 
Release 2016j - 2016-11-22 23:17:13 -0800 
 
  Briefly: Saratov, Russia moves from +03 to +04 on 2016-12-04. 
 
  Changes to future time stamps 
 
    Saratov, Russia switches from +03 to +04 on 2016-12-04 at 02:00. 
    This hives off a new zone Europe/Saratov from Europe/Volgograd. 
    (Thanks to Yuri Konotopov and Stepan Golosunov.) 
 
  Changes to past time stamps 
 
    The new zone Asia/Atyrau for Atyraū Region, Kazakhstan, is like 
    Asia/Aqtau except it switched from +05/+06 to +04/+05 in spring 
    1999, not fall 1994.  (Thanks to Stepan Golosunov.) 
 
  Changes to past time zone abbreviations 
 
    Asia/Gaza and Asia/Hebron now use "EEST", not "EET", to denote 
    summer time before 1948.  The old use of "EET" was a typo. 
 
  Changes to code 
 
    zic no longer mishandles file systems that lack hard links, fixing 
    bugs introduced in 2016g.  (Problems reported by Tom Lane.) 
    Also, when the destination already contains symbolic links, zic 
    should now work better on systems where the 'link' system call 
    does not follow symbolic links. 
 
  Changes to documentation and commentary 
 
    tz-link.htm now documents the relationship between release version 
    numbers and development-repository commit tags.  (Suggested by 
    Paul Koning.) 
 
    The 'Theory' file now documents UT. 
 
    iso3166.tab now accents "Curaçao", and commentary now mentions 
    the names "Cabo Verde" and "Czechia".  (Thanks to Jiří Boháč.) 
 
 
Release 2016i - 2016-11-01 23:19:52 -0700 
 
  Briefly: Cyprus split into two time zones on 2016-10-30, and Tonga 
  reintroduces DST on 2016-11-06. 
 
  Changes to future time stamps 
 
    Pacific/Tongatapu begins DST on 2016-11-06 at 02:00, ending on 
    2017-01-15 at 03:00.  Assume future observances in Tonga will be 
    from the first Sunday in November through the third Sunday in 
    January, like Fiji.  (Thanks to Pulu ʻAnau.)  Switch to numeric 
    time zone abbreviations for this zone. 
 
  Changes to past and future time stamps 
 
    Northern Cyprus is now +03 year round, causing a split in Cyprus 
    time zones starting 2016-10-30 at 04:00.  This creates a zone 
    Asia/Famagusta.  (Thanks to Even Scharning and Matt Johnson.) 
 
    Antarctica/Casey switched from +08 to +11 on 2016-10-22. 
    (Thanks to Steffen Thorsen.) 
 
  Changes to past time stamps 
 
    Several corrections were made for pre-1975 time stamps in Italy. 
    These affect Europe/Malta, Europe/Rome, Europe/San_Marino, and 
    Europe/Vatican. 
 
    First, the 1893-11-01 00:00 transition in Italy used the new UT 
    offset (+01), not the old (+00:49:56).  (Thanks to Michael 
    Deckers.) 
 
    Second, rules for daylight saving in Italy were changed to agree 
    with Italy's National Institute of Metrological Research (INRiM) 
    except for 1944, as follows (thanks to Pierpaolo Bernardi, Brian 
    Inglis, and Michael Deckers): 
 
      The 1916-06-03 transition was at 24:00, not 00:00. 
 
      The 1916-10-01, 1919-10-05, and 1920-09-19 transitions were at 
      00:00, not 01:00. 
 
      The 1917-09-30 and 1918-10-06 transitions were at 24:00, not 
      01:00. 
 
      The 1944-09-17 transition was at 03:00, not 01:00.  This 
      particular change is taken from Italian law as INRiM's table, 
      (which says 02:00) appears to have a typo here.  Also, keep the 
      1944-04-03 transition for Europe/Rome, as Rome was controlled by 
      Germany then. 
 
      The 1967-1970 and 1972-1974 fallback transitions were at 01:00, 
      not 00:00. 
 
  Changes to code 
 
    The code should now be buildable on AmigaOS merely by setting the 
    appropriate Makefile variables.  (From a patch by Carsten Larsen.) 
 
 
Release 2016h - 2016-10-19 23:17:57 -0700 
 
  Changes to future time stamps 
 
    Asia/Gaza and Asia/Hebron end DST on 2016-10-29 at 01:00, not 
    2016-10-21 at 00:00.  (Thanks to Sharef Mustafa.)  Predict that 
    future fall transitions will be on the last Saturday of October 
    at 01:00, which is consistent with predicted spring transitions 
    on the last Saturday of March.  (Thanks to Tim Parenti.) 
 
  Changes to past time stamps 
 
    In Turkey, transitions in 1986-1990 were at 01:00 standard time 
    not at 02:00, and the spring 1994 transition was on March 20, not 
    March 27.  (Thanks to Kıvanç Yazan.) 
 
  Changes to past and future time zone abbreviations 
 
    Asia/Colombo now uses numeric time zone abbreviations like "+0530" 
    instead of alphabetic ones like "IST" and "LKT".  Various 
    English-language sources use "IST", "LKT" and "SLST", with no 
    working consensus.  (Usage of "SLST" mentioned by Sadika 
    Sumanapala.) 
 
  Changes to code 
 
    zic no longer mishandles relativizing file names when creating 
    symbolic links like /etc/localtime, when these symbolic links 
    are outside the usual directory hierarchy.  This fixes a bug 
    introduced in 2016g.  (Problem reported by Andreas Stieger.) 
 
  Changes to build procedure 
 
    New rules 'traditional_tarballs' and 'traditional_signatures' for 
    building just the traditional-format distribution.  (Requested by 
    Deborah Goldsmith.) 
 
    The file 'version' is now put into the tzdata tarball too. 
    (Requested by Howard Hinnant.) 
 
  Changes to documentation and commentary 
 
    The 'Theory' file now has a section on interface stability. 
    (Requested by Paul Koning.)  It also mentions features like 
    tm_zone and localtime_rz that have long been supported by the 
    reference code. 
 
    tz-link.htm has improved coverage of time zone boundaries suitable 
    for geolocation.  (Thanks to heads-ups from Evan Siroky and Matt 
    Johnson.) 
 
    The US commentary now mentions Allen and the "day of two noons". 
 
    The Fiji commentary mentions the government's 2016-10-03 press 
    release.  (Thanks to Raymond Kumar.) 
 
 
Release 2016g - 2016-09-13 08:56:38 -0700 
 
  Changes to future time stamps 
 
    Turkey switched from EET/EEST (+02/+03) to permanent +03, 
    effective 2016-09-07.  (Thanks to Burak AYDIN.)  Use "+03" rather 
    than an invented abbreviation for the new time. 
 
    New leap second 2016-12-31 23:59:60 UTC as per IERS Bulletin C 52. 
    (Thanks to Tim Parenti.) 
 
  Changes to past time stamps 
 
    For America/Los_Angeles, spring-forward transition times have been 
    corrected from 02:00 to 02:01 in 1948, and from 02:00 to 01:00 in 
    1950-1966. 
 
    For zones using Soviet time on 1919-07-01, transitions to UT-based 
    time were at 00:00 UT, not at 02:00 local time.  The affected 
    zones are Europe/Kirov, Europe/Moscow, Europe/Samara, and 
    Europe/Ulyanovsk.  (Thanks to Alexander Belopolsky.) 
 
  Changes to past and future time zone abbreviations 
 
    The Factory zone now uses the time zone abbreviation -00 instead 
    of a long English-language string, as -00 is now the normal way to 
    represent an undefined time zone. 
 
    Several zones in Antarctica and the former Soviet Union, along 
    with zones intended for ships at sea that cannot use POSIX TZ 
    strings, now use numeric time zone abbreviations instead of 
    invented or obsolete alphanumeric abbreviations.  The affected 
    zones are Antarctica/Casey, Antarctica/Davis, 
    Antarctica/DumontDUrville, Antarctica/Mawson, Antarctica/Rothera, 
    Antarctica/Syowa, Antarctica/Troll, Antarctica/Vostok, 
    Asia/Anadyr, Asia/Ashgabat, Asia/Baku, Asia/Bishkek, Asia/Chita, 
    Asia/Dushanbe, Asia/Irkutsk, Asia/Kamchatka, Asia/Khandyga, 
    Asia/Krasnoyarsk, Asia/Magadan, Asia/Omsk, Asia/Sakhalin, 
    Asia/Samarkand, Asia/Srednekolymsk, Asia/Tashkent, Asia/Tbilisi, 
    Asia/Ust-Nera, Asia/Vladivostok, Asia/Yakutsk, Asia/Yekaterinburg, 
    Asia/Yerevan, Etc/GMT-14, Etc/GMT-13, Etc/GMT-12, Etc/GMT-11, 
    Etc/GMT-10, Etc/GMT-9, Etc/GMT-8, Etc/GMT-7, Etc/GMT-6, Etc/GMT-5, 
    Etc/GMT-4, Etc/GMT-3, Etc/GMT-2, Etc/GMT-1, Etc/GMT+1, Etc/GMT+2, 
    Etc/GMT+3, Etc/GMT+4, Etc/GMT+5, Etc/GMT+6, Etc/GMT+7, Etc/GMT+8, 
    Etc/GMT+9, Etc/GMT+10, Etc/GMT+11, Etc/GMT+12, Europe/Kaliningrad, 
    Europe/Minsk, Europe/Samara, Europe/Volgograd, and 
    Indian/Kerguelen.  For Europe/Moscow the invented abbreviation MSM 
    was replaced by +05, whereas MSK and MSD were kept as they are not 
    our invention and are widely used. 
 
  Changes to zone names 
 
    Rename Asia/Rangoon to Asia/Yangon, with a backward compatibility link. 
    (Thanks to David Massoud.) 
 
  Changes to code 
 
    zic no longer generates binary files containing POSIX TZ-like 
    strings that disagree with the local time type after the last 
    explicit transition in the data.  This fixes a bug with 
    Africa/Casablanca and Africa/El_Aaiun in some year-2037 time 
    stamps on the reference platform.  (Thanks to Alexander Belopolsky 
    for reporting the bug and suggesting a way forward.) 
 
    If the installed localtime and/or posixrules files are symbolic 
    links, zic now keeps them symbolic links when updating them, for 
    compatibility with platforms like OpenSUSE where other programs 
    configure these files as symlinks. 
 
    zic now avoids hard linking to symbolic links, avoids some 
    unnecessary mkdir and stat system calls, and uses shorter file 
    names internally. 
 
    zdump has a new -i option to generate transitions in a 
    more-compact but still human-readable format.  This option is 
    experimental, and the output format may change in future versions. 
    (Thanks to Jon Skeet for suggesting that an option was needed, 
    and thanks to Tim Parenti and Chris Rovick for further comments.) 
 
  Changes to build procedure 
 
    An experimental distribution format is available, in addition 
    to the traditional format which will continue to be distributed. 
    The new format is a tarball tzdb-VERSION.tar.lz with signature 
    file tzdb-VERSION.tar.lz.asc.  It unpacks to a top-level directory 
    tzdb-VERSION containing the code and data of the traditional 
    two-tarball format, along with extra data that may be useful. 
    (Thanks to Antonio Diaz Diaz, Oscar van Vlijmen, and many others 
    for comments about the experimental format.) 
 
    The release version number is now more accurate in the usual case 
    where releases are built from a Git repository.  For example, if 
    23 commits and some working-file changes have been made since 
    release 2016g, the version number is now something like 
    '2016g-23-g50556e3-dirty' instead of the misleading '2016g'. 
    Tagged releases use the same version number format as before, 
    e.g., '2016g'.  To support the more-accurate version number, its 
    specification has moved from a line in the Makefile to a new 
    source file 'version'. 
 
    The experimental distribution contains a file to2050.tzs that 
    contains what should be the output of 'zdump -i -c 2050' on 
    primary zones.  If this file is available, 'make check' now checks 
    that zdump generates this output. 
 
    'make check_web' now works on Fedora-like distributions. 
 
  Changes to documentation and commentary 
 
    tzfile.5 now documents the new restriction on POSIX TZ-like 
    strings that is now implemented by zic. 
 
    Comments now cite URLs for some 1917-1921 Russian DST decrees. 
    (Thanks to Alexander Belopolsky.) 
 
    tz-link.htm mentions JuliaTime (thanks to Curtis Vogt) and Time4J 
    (thanks to Meno Hochschild) and ThreeTen-Extra, and its 
    description of Java 8 has been brought up to date (thanks to 
    Stephen Colebourne).  Its description of local time on Mars has 
    been updated to match current practice, and URLs have been updated 
    and some obsolete ones removed. 
 
 
Release 2016f - 2016-07-05 16:26:51 +0200 
 
  Changes affecting future time stamps 
 
    The Egyptian government changed its mind on short notice, and 
    Africa/Cairo will not introduce DST starting 2016-07-07 after all. 
    (Thanks to Mina Samuel.) 
 
    Asia/Novosibirsk switches from +06 to +07 on 2016-07-24 at 02:00. 
    (Thanks to Stepan Golosunov.) 
 
  Changes to past and future time stamps 
 
    Asia/Novokuznetsk and Asia/Novosibirsk now use numeric time zone 
    abbreviations instead of invented ones. 
 
  Changes affecting past time stamps 
 
    Europe/Minsk's 1992-03-29 spring-forward transition was at 02:00 not 00:00. 
    (Thanks to Stepan Golosunov.) 
 
 
Release 2016e - 2016-06-14 08:46:16 -0700 
 
  Changes affecting future time stamps 
 
    Africa/Cairo observes DST in 2016 from July 7 to the end of October. 
    Guess October 27 and 24:00 transitions.  (Thanks to Steffen Thorsen.) 
    For future years, guess April's last Thursday to October's last 
    Thursday except for Ramadan. 
 
  Changes affecting past time stamps 
 
    Locations while uninhabited now use '-00', not 'zzz', as a 
    placeholder time zone abbreviation.  This is inspired by Internet 
    RFC 3339 and is more consistent with numeric time zone 
    abbreviations already used elsewhere.  The change affects several 
    arctic and antarctic locations, e.g., America/Cambridge_Bay before 
    1920 and Antarctica/Troll before 2005. 
 
    Asia/Baku's 1992-09-27 transition from +04 (DST) to +04 (non-DST) was 
    at 03:00, not 23:00 the previous day.  (Thanks to Michael Deckers.) 
 
  Changes to code 
 
    zic now outputs a dummy transition at time 2**31 - 1 in zones 
    whose POSIX-style TZ strings contain a '<'.  This mostly works 
    around Qt bug 53071 <https://bugreports.qt.io/browse/QTBUG-53071>. 
    (Thanks to Zhanibek Adilbekov for reporting the Qt bug.) 
 
  Changes affecting documentation and commentary 
 
    tz-link.htm says why governments should give plenty of notice for 
    time zone or DST changes, and refers to Matt Johnson's blog post. 
 
    tz-link.htm mentions Tzdata for Elixir.  (Thanks to Matt Johnson.) 
 
 
Release 2016d - 2016-04-17 22:50:29 -0700 
 
  Changes affecting future time stamps 
 
    America/Caracas switches from -0430 to -04 on 2016-05-01 at 02:30. 
    (Thanks to Alexander Krivenyshev for the heads-up.) 
 
    Asia/Magadan switches from +10 to +11 on 2016-04-24 at 02:00. 
    (Thanks to Alexander Krivenyshev and Matt Johnson.) 
 
    New zone Asia/Tomsk, split off from Asia/Novosibirsk.  It covers 
    Tomsk Oblast, Russia, which switches from +06 to +07 on 2016-05-29 
    at 02:00.  (Thanks to Stepan Golosunov.) 
 
  Changes affecting past time stamps 
 
    New zone Europe/Kirov, split off from Europe/Volgograd.  It covers 
    Kirov Oblast, Russia, which switched from +04/+05 to +03/+04 on 
    1989-03-26 at 02:00, roughly a year after Europe/Volgograd made 
    the same change.  (Thanks to Stepan Golosunov.) 
 
    Russia and nearby locations had daylight-saving transitions on 
    1992-03-29 at 02:00 and 1992-09-27 at 03:00, instead of on 
    1992-03-28 at 23:00 and 1992-09-26 at 23:00.  (Thanks to Stepan 
    Golosunov.) 
 
    Many corrections to historical time in Kazakhstan from 1991 
    through 2005.  (Thanks to Stepan Golosunov.)  Replace Kazakhstan's 
    invented time zone abbreviations with numeric abbreviations. 
 
  Changes to commentary 
 
    Mention Internet RFCs 7808 (TZDIST) and 7809 (CalDAV time zone references). 
 
 
Release 2016c - 2016-03-23 00:51:27 -0700 
 
  Changes affecting future time stamps 
 
    Azerbaijan no longer observes DST.  (Thanks to Steffen Thorsen.) 
 
    Chile reverts from permanent to seasonal DST.  (Thanks to Juan 
    Correa for the heads-up, and to Tim Parenti for corrections.) 
    Guess that future transitions are August's and May's second 
    Saturdays at 24:00 mainland time.  Also, call the period from 
    2014-09-07 through 2016-05-14 daylight saving time instead of 
    standard time, as that seems more appropriate now. 
 
  Changes affecting past time stamps 
 
    Europe/Kaliningrad and Europe/Vilnius changed from +03/+04 to 
    +02/+03 on 1989-03-26, not 1991-03-31.  Europe/Volgograd changed 
    from +04/+05 to +03/+04 on 1988-03-27, not 1989-03-26. 
    (Thanks to Stepan Golosunov.) 
 
  Changes to commentary 
 
    Several updates and URLs for historical and proposed Russian changes. 
    (Thanks to Stepan Golosunov, Matt Johnson, and Alexander Krivenyshev.) 
 
 
Release 2016b - 2016-03-12 17:30:14 -0800 
 
  Compatibility note 
 
    Starting with release 2016b, some data entries cause zic implementations 
    derived from tz releases 2005j through 2015e to issue warnings like 
    "time zone abbreviation differs from POSIX standard (+03)". 
    These warnings should not otherwise affect zic's output and can safely be 
    ignored on today's platforms, as the warnings refer to a restriction in 
    POSIX.1-1988 that was removed in POSIX.1-2001.  One way to suppress the 
    warnings is to upgrade to zic derived from tz releases 2015f and later. 
 
  Changes affecting future time stamps 
 
    New zones Europe/Astrakhan and Europe/Ulyanovsk for Astrakhan and 
    Ulyanovsk Oblasts, Russia, both of which will switch from +03 to +04 on 
    2016-03-27 at 02:00 local time.  They need distinct zones since their 
    post-1970 histories disagree.  New zone Asia/Barnaul for Altai Krai and 
    Altai Republic, Russia, which will switch from +06 to +07 on the same date 
    and local time.  The Astrakhan change is already official; the others have 
    passed the first reading in the State Duma and are extremely likely. 
    Also, Asia/Sakhalin moves from +10 to +11 on 2016-03-27 at 02:00. 
    (Thanks to Alexander Krivenyshev for the heads-up, and to Matt Johnson 
    and Stepan Golosunov for followup.) 
 
    As a trial of a new system that needs less information to be made up, 
    the new zones use numeric time zone abbreviations like "+04" 
    instead of invented abbreviations like "ASTT". 
 
    Haiti will not observe DST in 2016.  (Thanks to Jean Antoine via 
    Steffen Thorsen.) 
 
    Palestine's spring-forward transition on 2016-03-26 is at 01:00, not 00:00. 
    (Thanks to Hannah Kreitem.) Guess future transitions will be March's last 
    Saturday at 01:00, not March's last Friday at 24:00. 
 
  Changes affecting past time stamps 
 
    Europe/Chisinau observed DST during 1990, and switched from +04 to 
    +03 at 1990-05-06 02:00, instead of switching from +03 to +02. 
    (Thanks to Stepan Golosunov.) 
 
    1991 abbreviations in Europe/Samara should be SAMT/SAMST, not 
    KUYT/KUYST.  (Thanks to Stepan Golosunov.) 
 
  Changes to code 
 
    tzselect's diagnostics and checking, and checktab.awk's checking, 
    have been improved.  (Thanks to J William Piggott.) 
 
    tzcode now builds under MinGW.  (Thanks to Ian Abbott and Esben Haabendal.) 
 
    tzselect now tests Julian-date TZ settings more accurately. 
    (Thanks to J William Piggott.) 
 
  Changes to commentary 
 
    Comments in zone tables have been improved.  (Thanks to J William Piggott.) 
 
    tzselect again limits its menu comments so that menus fit on a 
    24×80 alphanumeric display. 
 
    A new web page tz-how-to.html.  (Thanks to Bill Seymour.) 
 
    In the Theory file, the description of possible time zone abbreviations in 
    tzdata has been cleaned up, as the old description was unclear and 
    inconsistent.  (Thanks to Alain Mouette for reporting the problem.) 
 
 
Release 2016a - 2016-01-26 23:28:02 -0800 
 
  Changes affecting future time stamps 
 
    America/Cayman will not observe daylight saving this year after all. 
    Revert our guess that it would.  (Thanks to Matt Johnson.) 
 
    Asia/Chita switches from +0800 to +0900 on 2016-03-27 at 02:00. 
    (Thanks to Alexander Krivenyshev.) 
 
    Asia/Tehran now has DST predictions for the year 2038 and later, 
    to be March 21 00:00 to September 21 00:00.  This is likely better 
    than predicting no DST, albeit off by a day every now and then. 
 
  Changes affecting past and future time stamps 
 
    America/Metlakatla switched from PST all year to AKST/AKDT on 
    2015-11-01 at 02:00.  (Thanks to Steffen Thorsen.) 
 
    America/Santa_Isabel has been removed, and replaced with a 
    backward compatibility link to America/Tijuana.  Its contents were 
    apparently based on a misreading of Mexican legislation. 
 
  Changes affecting past time stamps 
 
    Asia/Karachi's two transition times in 2002 were off by a minute. 
    (Thanks to Matt Johnson.) 
 
  Changes affecting build procedure 
 
    An installer can now combine leap seconds with use of the backzone file, 
    e.g., with 'make PACKRATDATA=backzone REDO=posix_right zones'. 
    The old 'make posix_packrat' rule is now marked as obsolescent. 
    (Thanks to Ian Abbott for an initial implementation.) 
 
  Changes affecting documentation and commentary 
 
    A new file LICENSE makes it easier to see that the code and data 
    are mostly public-domain.  (Thanks to James Knight.)  The three 
    non-public-domain files now use the current (3-clause) BSD license 
    instead of older versions of that license. 
 
    tz-link.htm mentions the BDE library (thanks to Andrew Paprocki), 
    CCTZ (thanks to Tim Parenti), TimeJones.com, and has a new section 
    on editing tz source files (with a mention of Sublime zoneinfo, 
    thanks to Gilmore Davidson). 
 
    The Theory and asia files now mention the 2015 book "The Global 
    Transformation of Time, 1870-1950", and cite a couple of reviews. 
 
    The America/Chicago entry now documents the informal use of US 
    central time in Fort Pierre, South Dakota.  (Thanks to Rick 
    McDermid, Matt Johnson, and Steve Jones.) 
 
 
Release 2015g - 2015-10-01 00:39:51 -0700 
 
  Changes affecting future time stamps 
 
    Turkey's 2015 fall-back transition is scheduled for Nov. 8, not Oct. 25. 
    (Thanks to Fatih.) 
 
    Norfolk moves from +1130 to +1100 on 2015-10-04 at 02:00 local time. 
    (Thanks to Alexander Krivenyshev.) 
 
    Fiji's 2016 fall-back transition is scheduled for January 17, not 24. 
    (Thanks to Ken Rylander.) 
 
    Fort Nelson, British Columbia will not fall back on 2015-11-01.  It has 
    effectively been on MST (-0700) since it advanced its clocks on 2015-03-08. 
    New zone America/Fort_Nelson.  (Thanks to Matt Johnson.) 
 
  Changes affecting past time stamps 
 
    Norfolk observed DST from 1974-10-27 02:00 to 1975-03-02 02:00. 
 
  Changes affecting code 
 
    localtime no longer mishandles America/Anchorage after 2037. 
    (Thanks to Bradley White for reporting the bug.) 
 
    On hosts with signed 32-bit time_t, localtime no longer mishandles 
    Pacific/Fiji after 2038-01-16 14:00 UTC. 
 
    The localtime module allows the variables 'timezone', 'daylight', 
    and 'altzone' to be in common storage shared with other modules, 
    and declares them in case the system <time.h> does not. 
    (Problems reported by Kees Dekker.) 
 
    On platforms with tm_zone, strftime.c now assumes it is not NULL. 
    This simplifies the code and is consistent with zdump.c. 
    (Problem reported by Christos Zoulas.) 
 
  Changes affecting documentation 
 
   The tzfile man page now documents that transition times denote the 
   starts (not the ends) of the corresponding time periods. 
   (Ambiguity reported by Bill Seymour.) 
 
 
Release 2015f - 2015-08-10 18:06:56 -0700 
 
  Changes affecting future time stamps 
 
    North Korea switches to +0830 on 2015-08-15.  (Thanks to Steffen Thorsen.) 
    The abbreviation remains "KST".  (Thanks to Robert Elz.) 
 
    Uruguay no longer observes DST.  (Thanks to Steffen Thorsen 
    and Pablo Camargo.) 
 
  Changes affecting past and future time stamps 
 
    Moldova starts and ends DST at 00:00 UTC, not at 01:00 UTC. 
    (Thanks to Roman Tudos.) 
 
  Changes affecting data format and code 
 
    zic's '-y YEARISTYPE' option is no longer documented.  The TYPE 
    field of a Rule line should now be '-'; the old values 'even', 
    'odd', 'uspres', 'nonpres', 'nonuspres' were already undocumented. 
    Although the implementation has not changed, these features do not 
    work in the default installation, they are not used in the data, 
    and they are now considered obsolescent. 
 
    zic now checks that two rules don't take effect at the same time. 
    (Thanks to Jon Skeet and Arthur David Olson.)  Constraints on 
    simultaneity are now documented. 
 
    The two characters '%z' in a zone format now stand for the UT 
    offset, e.g., '-07' for seven hours behind UT and '+0530' for 
    five hours and thirty minutes ahead.  This better supports time 
    zone abbreviations conforming to POSIX.1-2001 and later. 
 
  Changes affecting installed data files 
 
    Comments for America/Halifax and America/Glace_Bay have been improved. 
    (Thanks to Brian Inglis.) 
 
    Data entries have been simplified for Atlantic/Canary, Europe/Simferopol, 
    Europe/Sofia, and Europe/Tallinn.  This yields slightly smaller 
    installed data files for Europe/Simferopol and Europe/Tallinn. 
    It does not affect timestamps.  (Thanks to Howard Hinnant.) 
 
  Changes affecting code 
 
    zdump and zic no longer warn about valid time zone abbreviations 
    like '-05'. 
 
    Some Visual Studio 2013 warnings have been suppressed. 
    (Thanks to Kees Dekker.) 
 
    'date' no longer sets the time of day and its -a, -d, -n and -t 
    options have been removed.  Long obsolescent, the implementation 
    of these features had porting problems.  Builders no longer need 
    to configure HAVE_ADJTIME, HAVE_SETTIMEOFDAY, or HAVE_UTMPX_H. 
    (Thanks to Kees Dekker for pointing out the problem.) 
 
  Changes affecting documentation 
 
    The Theory file mentions naming issues earlier, as these seem to be 
    poorly publicized (thanks to Gilmore Davidson for reporting the problem). 
 
    tz-link.htm mentions Time Zone Database Parser (thanks to Howard Hinnant). 
 
    Mention that Herbert Samuel introduced the term "Summer Time". 
 
 
Release 2015e - 2015-06-13 10:56:02 -0700 
 
  Changes affecting future time stamps 
 
    Morocco will suspend DST from 2015-06-14 03:00 through 2015-07-19 02:00, 
    not 06-13 and 07-18 as we had guessed.  (Thanks to Milamber.) 
 
    Assume Cayman Islands will observe DST starting next year, using US rules. 
    Although it isn't guaranteed, it is the most likely. 
 
  Changes affecting data format 
 
    The file 'iso3166.tab' now uses UTF-8, so that its entries can better 
    spell the names of Åland Islands, Côte d'Ivoire, and Réunion. 
 
  Changes affecting code 
 
    When displaying data, tzselect converts it to the current locale's 
    encoding if the iconv command works.  (Problem reported by random832.) 
 
    tzselect no longer mishandles Dominica, fixing a bug introduced 
    in Release 2014f.  (Problem reported by Owen Leibman.) 
 
    zic -l no longer fails when compiled with -DTZDEFAULT=\"/etc/localtime\". 
    This fixes a bug introduced in Release 2014f. 
    (Problem reported by Leonardo Chiquitto.) 
 
 
Release 2015d - 2015-04-24 08:09:46 -0700 
 
  Changes affecting future time stamps 
 
    Egypt will not observe DST in 2015 and will consider canceling it 
    permanently.  For now, assume no DST indefinitely. 
    (Thanks to Ahmed Nazmy and Tim Parenti.) 
 
  Changes affecting past time stamps 
 
    America/Whitehorse switched from UT -09 to -08 on 1967-05-28, not 
    1966-07-01.  Also, Yukon's time zone history is documented better. 
    (Thanks to Brian Inglis and Dennis Ferguson.) 
 
  Change affecting past and future time zone abbreviations 
 
    The abbreviations for Hawaii-Aleutian standard and daylight times 
    have been changed from HAST/HADT to HST/HDT, as per US Government 
    Printing Office style.  This affects only America/Adak since 1983, 
    as America/Honolulu was already using the new style. 
 
  Changes affecting code 
 
   zic has some minor performance improvements. 
 
 
Release 2015c - 2015-04-11 08:55:55 -0700 
 
  Changes affecting future time stamps 
 
    Egypt's spring-forward transition is at 24:00 on April's last Thursday, 
    not 00:00 on April's last Friday.  2015's transition will therefore be on 
    Thursday, April 30 at 24:00, not Friday, April 24 at 00:00.  Similar fixes 
    apply to 2026, 2037, 2043, etc.  (Thanks to Steffen Thorsen.) 
 
  Changes affecting past time stamps 
 
    The following changes affect some pre-1991 Chile-related time stamps 
    in America/Santiago, Antarctica/Palmer, and Pacific/Easter. 
 
      The 1910 transition was January 10, not January 1. 
 
      The 1918 transition was September 10, not September 1. 
 
      The UT -04 time observed from 1932 to 1942 is now considered to 
      be standard time, not year-round DST. 
 
      Santiago observed DST (UT -03) from 1946-07-15 through 
      1946-08-31, then reverted to standard time, then switched to -05 
      on 1947-04-01. 
 
      Assume transitions before 1968 were at 00:00, since we have no data 
      saying otherwise. 
 
      The spring 1988 transition was 1988-10-09, not 1988-10-02. 
      The fall 1990 transition was 1990-03-11, not 1990-03-18. 
 
      Assume no UT offset change for Pacific/Easter on 1890-01-01, 
      and omit all transitions on Pacific/Easter from 1942 through 1946 
      since we have no data suggesting that they existed. 
 
    One more zone has been turned into a link, as it differed 
    from an existing zone only for older time stamps.  As usual, 
    this change affects UT offsets in pre-1970 time stamps only. 
    The zone's old contents have been moved to the 'backzone' file. 
    The affected zone is America/Montreal. 
 
  Changes affecting commentary 
 
    Mention the TZUpdater tool. 
 
    Mention "The Time Now".  (Thanks to Brandon Ramsey.) 
 
 
Release 2015b - 2015-03-19 23:28:11 -0700 
 
  Changes affecting future time stamps 
 
    Mongolia will start observing DST again this year, from the last 
    Saturday in March at 02:00 to the last Saturday in September at 00:00. 
    (Thanks to Ganbold Tsagaankhuu.) 
 
    Palestine will start DST on March 28, not March 27.  Also, 
    correct the fall 2014 transition from September 26 to October 24. 
    Adjust future predictions accordingly.  (Thanks to Steffen Thorsen.) 
 
  Changes affecting past time stamps 
 
    The 1982 zone shift in Pacific/Easter has been corrected, fixing a 2015a 
    regression.  (Thanks to Stuart Bishop for reporting the problem.) 
 
    Some more zones have been turned into links, when they differed 
    from existing zones only for older time stamps.  As usual, 
    these changes affect UT offsets in pre-1970 time stamps only. 
    Their old contents have been moved to the 'backzone' file. 
    The affected zones are: America/Antigua, America/Cayman, 
    Pacific/Midway, and Pacific/Saipan. 
 
  Changes affecting time zone abbreviations 
 
    Correct the 1992-2010 DST abbreviation in Volgograd from "MSK" to "MSD". 
    (Thanks to Hank W.) 
 
  Changes affecting code 
 
    Fix integer overflow bug in reference 'mktime' implementation. 
    (Problem reported by Jörg Richter.) 
 
    Allow -Dtime_tz=time_t compilations, and allow -Dtime_tz=... libraries 
    to be used in the same executable as standard-library time_t functions. 
    (Problems reported by Bradley White.) 
 
  Changes affecting commentary 
 
    Cite the recent Mexican decree changing Quintana Roo's time zone. 
    (Thanks to Carlos Raúl Perasso.) 
 
    Likewise for the recent Chilean decree.  (Thanks to Eduardo Romero Urra.) 
 
    Update info about Mars time. 
 
 
Release 2015a - 2015-01-29 22:35:20 -0800 
 
  Changes affecting future time stamps 
 
    The Mexican state of Quintana Roo, represented by America/Cancun, 
    will shift from Central Time with DST to Eastern Time without DST 
    on 2015-02-01 at 02:00.  (Thanks to Steffen Thorsen and Gwillim Law.) 
 
    Chile will not change clocks in April or thereafter; its new standard time 
    will be its old daylight saving time.  This affects America/Santiago, 
    Pacific/Easter, and Antarctica/Palmer.  (Thanks to Juan Correa.) 
 
    New leap second 2015-06-30 23:59:60 UTC as per IERS Bulletin C 49. 
    (Thanks to Tim Parenti.) 
 
  Changes affecting past time stamps 
 
    Iceland observed DST in 1919 and 1921, and its 1939 fallback 
    transition was Oct. 29, not Nov. 29.  Remove incorrect data from 
    Shanks about time in Iceland between 1837 and 1908. 
 
    Some more zones have been turned into links, when they differed 
    from existing zones only for older time stamps.  As usual, 
    these changes affect UT offsets in pre-1970 time stamps only. 
    Their old contents have been moved to the 'backzone' file. 
    The affected zones are: Asia/Aden, Asia/Bahrain, Asia/Kuwait, 
    and Asia/Muscat. 
 
  Changes affecting code 
 
    tzalloc now scrubs time zone abbreviations compatibly with the way 
    that tzset always has, by replacing invalid bytes with '_' and by 
    shortening too-long abbreviations. 
 
    tzselect ports to POSIX awk implementations, no longer mishandles 
    POSIX TZ settings when GNU awk is used, and reports POSIX TZ 
    settings to the user.  (Thanks to Stefan Kuhn.) 
 
  Changes affecting build procedure 
 
    'make check' now checks for links to links in the data. 
    One such link (for Africa/Asmera) has been fixed. 
    (Thanks to Stephen Colebourne for pointing out the problem.) 
 
  Changes affecting commentary 
 
    The leapseconds file commentary now mentions the expiration date. 
    (Problem reported by Martin Burnicki.) 
 
    Update Mexican Library of Congress URL. 
 
 
Release 2014j - 2014-11-10 17:37:11 -0800 
 
  Changes affecting current and future time stamps 
 
    Turks & Caicos' switch from US eastern time to UT -04 year-round 
    did not occur on 2014-11-02 at 02:00.  It's currently scheduled 
    for 2015-11-01 at 02:00.  (Thanks to Chris Walton.) 
 
  Changes affecting past time stamps 
 
    Many pre-1989 time stamps have been corrected for Asia/Seoul and 
    Asia/Pyongyang, based on sources for the Korean-language Wikipedia 
    entry for time in Korea.  (Thanks to Sanghyuk Jung.)  Also, no 
    longer guess that Pyongyang mimicked Seoul time after World War II, 
    as this is politically implausible. 
 
    Some more zones have been turned into links, when they differed 
    from existing zones only for older time stamps.  As usual, 
    these changes affect UT offsets in pre-1970 time stamps only. 
    Their old contents have been moved to the 'backzone' file. 
    The affected zones are: Africa/Addis_Ababa, Africa/Asmara, 
    Africa/Dar_es_Salaam, Africa/Djibouti, Africa/Kampala, 
    Africa/Mogadishu, Indian/Antananarivo, Indian/Comoro, and 
    Indian/Mayotte. 
 
  Changes affecting commentary 
 
    The commentary is less enthusiastic about Shanks as a source, 
    and is more careful to distinguish UT from UTC. 
 
 
Release 2014i - 2014-10-21 22:04:57 -0700 
 
  Changes affecting future time stamps 
 
    Pacific/Fiji will observe DST from 2014-11-02 02:00 to 2015-01-18 03:00. 
    (Thanks to Ken Rylander for the heads-up.)  Guess that future 
    years will use a similar pattern. 
 
    A new Zone Pacific/Bougainville, for the part of Papua New Guinea 
    that plans to switch from UT +10 to +11 on 2014-12-28 at 02:00. 
    (Thanks to Kiley Walbom for the heads-up.) 
 
  Changes affecting time zone abbreviations 
 
    Since Belarus is not changing its clocks even though Moscow is, 
    the time zone abbreviation in Europe/Minsk is changing from FET 
    to its more-traditional value MSK on 2014-10-26 at 01:00. 
    (Thanks to Alexander Bokovoy for the heads-up about Belarus.) 
 
    The new abbreviation IDT stands for the pre-1976 use of UT +08 in 
    Indochina, to distinguish it better from ICT (+07). 
 
  Changes affecting past time stamps 
 
    Many time stamps have been corrected for Asia/Ho_Chi_Minh before 1976 
    (thanks to Trần Ngọc Quân for an indirect pointer to Trần Tiến Bình's 
    authoritative book).  Asia/Ho_Chi_Minh has been added to 
    zone1970.tab, to give tzselect users in Vietnam two choices, 
    since north and south Vietnam disagreed after our 1970 cutoff. 
 
    Asia/Phnom_Penh and Asia/Vientiane have been turned into links, as 
    they differed from existing zones only for older time stamps.  As 
    usual, these changes affect pre-1970 time stamps only.  Their old 
    contents have been moved to the 'backzone' file. 
 
  Changes affecting code 
 
    The time-related library functions now set errno on failure, and 
    some crashes in the new tzalloc-related library functions have 
    been fixed.  (Thanks to Christos Zoulas for reporting most of 
    these problems and for suggesting fixes.) 
 
    If USG_COMPAT is defined and the requested timestamp is standard time, 
    the tz library's localtime and mktime functions now set the extern 
    variable timezone to a value appropriate for that timestamp; and 
    similarly for ALTZONE, daylight saving time, and the altzone variable. 
    This change is a companion to the tzname change in 2014h, and is 
    designed to make timezone and altzone more compatible with tzname. 
 
    The tz library's functions now set errno to EOVERFLOW if they fail 
    because the result cannot be represented.  ctime and ctime_r now 
    return NULL and set errno when a timestamp is out of range, rather 
    than having undefined behavior. 
 
    Some bugs associated with the new 2014g functions have been fixed. 
    This includes a bug that largely incapacitated the new functions 
    time2posix_z and posix2time_z.  (Thanks to Christos Zoulas.) 
    It also includes some uses of uninitialized variables after tzalloc. 
    The new code uses the standard type 'ssize_t', which the Makefile 
    now gives porting advice about. 
 
  Changes affecting commentary 
 
    Updated URLs for NRC Canada (thanks to Matt Johnson and Brian Inglis). 
 
 
Release 2014h - 2014-09-25 18:59:03 -0700 
 
  Changes affecting past timestamps 
 
    America/Jamaica's 1974 spring-forward transition was Jan. 6, not Apr. 28. 
 
    Shanks says Asia/Novokuznetsk switched from LMT (not "NMT") on 1924-05-01, 
    not 1920-01-06.  The old entry was based on a misinterpretation of Shanks. 
 
    Some more zones have been turned into links, when they differed 
    from existing zones only for older timestamps.  As usual, 
    these changes affect UT offsets in pre-1970 timestamps only. 
    Their old contents have been moved to the 'backzone' file. 
    The affected zones are: Africa/Blantyre, Africa/Bujumbura, 
    Africa/Gaborone, Africa/Harare, Africa/Kigali, Africa/Lubumbashi, 
    Africa/Lusaka, Africa/Maseru, and Africa/Mbabane. 
 
  Changes affecting code 
 
    zdump -V and -v now output gmtoff= values on all platforms, 
    not merely on platforms defining TM_GMTOFF. 
 
    The tz library's localtime and mktime functions now set tzname to a value 
    appropriate for the requested timestamp, and zdump now uses this 
    on platforms not defining TM_ZONE, fixing a 2014g regression. 
    (Thanks to Tim Parenti for reporting the problem.) 
 
    The tz library no longer sets tzname if localtime or mktime fails. 
 
    zdump -c no longer mishandles transitions near year boundaries. 
    (Thanks to Tim Parenti for reporting the problem.) 
 
    An access to uninitialized data has been fixed. 
    (Thanks to Jörg Richter for reporting the problem.) 
 
    When THREAD_SAFE is defined, the code ports to the C11 memory model. 
    A memory leak has been fixed if ALL_STATE and THREAD_SAFE are defined 
    and two threads race to initialize data used by gmtime-like functions. 
    (Thanks to Andy Heninger for reporting the problems.) 
 
  Changes affecting build procedure 
 
    'make check' now checks better for properly-sorted data. 
 
  Changes affecting documentation and commentary 
 
    zdump's gmtoff=N output is now documented, and its isdst=D output 
    is now documented to possibly output D values other than 0 or 1. 
 
    zdump -c's treatment of years is now documented to use the 
    Gregorian calendar and Universal Time without leap seconds, 
    and its behavior at cutoff boundaries is now documented better. 
    (Thanks to Arthur David Olson and Tim Parenti for reporting the problems.) 
 
    Programs are now documented to use the proleptic Gregorian calendar. 
    (Thanks to Alan Barrett for the suggestion.) 
 
    Fractional-second GMT offsets have been documented for civil time 
    in 19th-century Chennai, Jakarta, and New York. 
 
 
Release 2014g - 2014-08-28 12:31:23 -0700 
 
  Changes affecting future timestamps 
 
    Turks & Caicos is switching from US eastern time to UT -04 
    year-round, modeled as a switch on 2014-11-02 at 02:00. 
    [As noted in 2014j, this switch was later delayed.] 
 
  Changes affecting past timestamps 
 
    Time in Russia or the USSR before 1926 or so has been corrected by 
    a few seconds in the following zones: Asia/Irkutsk, 
    Asia/Krasnoyarsk, Asia/Omsk, Asia/Samarkand, Asia/Tbilisi, 
    Asia/Vladivostok, Asia/Yakutsk, Europe/Riga, Europe/Samara.  For 
    Asia/Yekaterinburg the correction is a few minutes.  (Thanks to 
    Vladimir Karpinsky.) 
 
    The Portuguese decree of 1911-05-26 took effect on 1912-01-01. 
    This affects 1911 timestamps in Africa/Bissau, Africa/Luanda, 
    Atlantic/Azores, and Atlantic/Madeira.  Also, Lisbon's pre-1912 
    GMT offset was -0:36:45 (rounded from -0:36:44.68), not -0:36:32. 
    (Thanks to Stephen Colebourne for pointing to the decree.) 
 
    Asia/Dhaka ended DST on 2009-12-31 at 24:00, not 23:59. 
 
    A new file 'backzone' contains data which may appeal to 
    connoisseurs of old timestamps, although it is out of scope for 
    the tz database, is often poorly sourced, and contains some data 
    that is known to be incorrect.  The new file is not recommended 
    for ordinary use and its entries are not installed by default. 
    (Thanks to Lester Caine for the high-quality Jersey, Guernsey, and 
    Isle of Man entries.) 
 
    Some more zones have been turned into links, when they differed 
    from existing zones only for older timestamps.  As usual, 
    these changes affect UT offsets in pre-1970 timestamps only. 
    Their old contents have been moved to the 'backzone' file. 
    The affected zones are: Africa/Bangui, Africa/Brazzaville, 
    Africa/Douala, Africa/Kinshasa, Africa/Libreville, Africa/Luanda, 
    Africa/Malabo, Africa/Niamey, and Africa/Porto-Novo. 
 
  Changes affecting code 
 
    Unless NETBSD_INSPIRED is defined to 0, the tz library now 
    supplies functions for creating and using objects that represent 
    time zones. The new functions are tzalloc, tzfree, localtime_rz, 
    mktime_z, and (if STD_INSPIRED is also defined) posix2time_z and 
    time2posix_z.  They are intended for performance: for example, 
    localtime_rz (unlike localtime_r) is trivially thread-safe without 
    locking.  (Thanks to Christos Zoulas for proposing NetBSD-inspired 
    functions, and to Alan Barrett and Jonathan Lennox for helping to 
    debug the change.) 
 
    zdump now builds with the tz library unless USE_LTZ is defined to 0, 
    This lets zdump use tz features even if the system library lacks them. 
    To build zdump with the system library, use 'make CFLAGS=-DUSE_LTZ=0 
    TZDOBJS=zdump.o CHECK_TIME_T_ALTERNATIVES='. 
 
    zdump now uses localtime_rz if available, as it's significantly faster, 
    and it can help zdump better diagnose invalid time zone names. 
    Define HAVE_LOCALTIME_RZ to 0 to suppress this.  HAVE_LOCALTIME_RZ 
    defaults to 1 if NETBSD_INSPIRED && USE_LTZ.  When localtime_rz is 
    not available, zdump now uses localtime_r and tzset if available, 
    as this is a bit cleaner and faster than plain localtime.  Compile 
    with -DHAVE_LOCALTIME_R=0 and/or -DHAVE_TZSET=0 if your system 
    lacks these two functions. 
 
    If THREAD_SAFE is defined to 1, the tz library is now thread-safe. 
    Although not needed for tz's own applications, which are single-threaded, 
    this supports POSIX better if the tz library is used in multithreaded apps. 
 
    Some crashes have been fixed when zdump or the tz library is given 
    invalid or outlandish input. 
 
    The tz library no longer mishandles leap seconds on platforms with 
    unsigned time_t in time zones that lack ordinary transitions after 1970. 
 
    The tz code now attempts to infer TM_GMTOFF and TM_ZONE if not 
    already defined, to make it easier to configure on common platforms. 
    Define NO_TM_GMTOFF and NO_TM_ZONE to suppress this. 
 
    Unless the new macro UNINIT_TRAP is defined to 1, the tz code now 
    assumes that reading uninitialized memory yields garbage values 
    but does not cause other problems such as traps. 
 
    If TM_GMTOFF is defined and UNINIT_TRAP is 0, mktime is now 
    more likely to guess right for ambiguous timestamps near 
    transitions where tm_isdst does not change. 
 
    If HAVE_STRFTIME_L is defined to 1, the tz library now defines 
    strftime_l for compatibility with recent versions of POSIX. 
    Only the C locale is supported, though.  HAVE_STRFTIME_L defaults 
    to 1 on recent POSIX versions, and to 0 otherwise. 
 
    tzselect -c now uses a hybrid distance measure that works better 
    in Africa.  (Thanks to Alan Barrett for noting the problem.) 
 
    The C source code now ports to NetBSD when GCC_DEBUG_FLAGS is used, 
    or when time_tz is defined. 
 
    When HAVE_UTMPX_H is set the 'date' command now builds on systems 
    whose <utmpx.h> file does not define WTMPX_FILE, and when setting 
    the date it updates the wtmpx file if _PATH_WTMPX is defined. 
    This affects GNU/Linux and similar systems. 
 
    For easier maintenance later, some C code has been simplified, 
    some lint has been removed, and the code has been tweaked so that 
    plain 'make' is more likely to work. 
 
    The C type 'bool' is now used for boolean values, instead of 'int'. 
 
    The long-obsolete LOCALE_HOME code has been removed. 
 
    The long-obsolete 'gtime' function has been removed. 
 
  Changes affecting build procedure 
 
    'zdump' no longer links in ialloc.o, as it's not needed. 
 
    'make check_time_t_alternatives' no longer assumes GNU diff. 
 
  Changes affecting distribution tarballs 
 
    The files checktab.awk and zoneinfo2tdf.pl are now distributed in 
    the tzdata tarball instead of the tzcode tarball, since they help 
    maintain the data.  The NEWS and Theory files are now also 
    distributed in the tzdata tarball, as they're relevant for data. 
    (Thanks to Alan Barrett for pointing this out.)  Also, the 
    leapseconds.awk file is no longer distributed in the tzcode 
    tarball, since it belongs in the tzdata tarball (where 2014f 
    inadvertently also distributed it). 
 
  Changes affecting documentation and commentary 
 
    A new file CONTRIBUTING is distributed.  (Thanks to Tim Parenti for 
    suggesting a CONTRIBUTING file, and to Tony Finch and Walter Harms 
    for debugging it.) 
 
    The man pages have been updated to use function prototypes, 
    to document thread-safe variants like localtime_r, and to document 
    the NetBSD-inspired functions tzalloc, tzfree, localtime_rz, and 
    mktime_z. 
 
    The fields in Link lines have been renamed to be more descriptive 
    and more like the parameters of 'ln'.  LINK-FROM has become TARGET, 
    and LINK-TO has become LINK-NAME. 
 
    tz-link.htm mentions the IETF's tzdist working group; Windows 
    Runtime etc. (thanks to Matt Johnson); and HP-UX's tztab. 
 
    Some broken URLs have been fixed in the commentary.  (Thanks to 
    Lester Caine.) 
 
    Commentary about Philippines DST has been updated, and commentary 
    on pre-1970 time in India has been added. 
 
 
Release 2014f - 2014-08-05 17:42:36 -0700 
 
  Changes affecting future timestamps 
 
    Russia will subtract an hour from most of its time zones on 2014-10-26 
    at 02:00 local time.  (Thanks to Alexander Krivenyshev.) 
    There are a few exceptions: Magadan Oblast (Asia/Magadan) and Zabaykalsky 
    Krai are subtracting two hours; conversely, Chukotka Autonomous Okrug 
    (Asia/Anadyr), Kamchatka Krai (Asia/Kamchatka), Kemerovo Oblast 
    (Asia/Novokuznetsk), and the Samara Oblast and the Udmurt Republic 
    (Europe/Samara) are not changing their clocks.  The changed zones are 
    Europe/Kaliningrad, Europe/Moscow, Europe/Simferopol, Europe/Volgograd, 
    Asia/Yekaterinburg, Asia/Omsk, Asia/Novosibirsk, Asia/Krasnoyarsk, 
    Asia/Irkutsk, Asia/Yakutsk, Asia/Vladivostok, Asia/Khandyga, 
    Asia/Sakhalin, and Asia/Ust-Nera; Asia/Magadan will have two hours 
    subtracted; and Asia/Novokuznetsk's time zone abbreviation is affected, 
    but not its UTC offset.  Two zones are added: Asia/Chita (split 
    from Asia/Yakutsk, and also with two hours subtracted) and 
    Asia/Srednekolymsk (split from Asia/Magadan, but with only one hour 
    subtracted).  (Thanks to Tim Parenti for much of the above.) 
 
  Changes affecting time zone abbreviations 
 
    Australian eastern time zone abbreviations are now AEST/AEDT not EST, 
    and similarly for the other Australian zones.  That is, for eastern 
    standard and daylight saving time the abbreviations are AEST and AEDT 
    instead of the former EST for both; similarly, ACST/ACDT, ACWST/ACWDT, 
    and AWST/AWDT are now used instead of the former CST, CWST, and WST. 
    This change does not affect UT offsets, only time zone abbreviations. 
    (Thanks to Rich Tibbett and many others.) 
 
    Asia/Novokuznetsk shifts from NOVT to KRAT (remaining on UT +07) 
    effective 2014-10-26 at 02:00 local time. 
 
    The time zone abbreviation for Xinjiang Time (observed in Ürümqi) 
    has been changed from URUT to XJT.  (Thanks to Luther Ma.) 
 
    Prefer MSK/MSD for Moscow time in Russia, even in other cities. 
    Similarly, prefer EET/EEST for eastern European time in Russia. 
 
    Change time zone abbreviations in (western) Samoa to use "ST" and 
    "DT" suffixes, as this is more likely to match common practice. 
    Prefix "W" to (western) Samoa time when its standard-time offset 
    disagrees with that of American Samoa. 
 
    America/Metlakatla now uses PST, not MeST, to abbreviate its time zone. 
 
    Time zone abbreviations have been updated for Japan's two time 
    zones used 1896-1937.  JWST now stands for Western Standard 
    Time, and JCST for Central Standard Time (formerly this was CJT). 
    These abbreviations are now used for time in Korea, Taiwan, 
    and Sakhalin while controlled by Japan. 
 
  Changes affecting past timestamps 
 
    China's five zones have been simplified to two, since the post-1970 
    differences in the other three seem to have been imaginary.  The 
    zones Asia/Harbin, Asia/Chongqing, and Asia/Kashgar have been 
    removed; backwards-compatibility links still work, albeit with 
    different behaviors for timestamps before May 1980.  Asia/Urumqi's 
    1980 transition to UT +08 has been removed, so that it is now at 
    +06 and not +08.  (Thanks to Luther Ma and to Alois Treindl; 
    Treindl sent helpful translations of two papers by Guo Qingsheng.) 
 
    Some zones have been turned into links, when they differed from existing 
    zones only for older UT offsets where data entries were likely invented. 
    These changes affect UT offsets in pre-1970 timestamps only.  This is 
    similar to the change in release 2013e, except this time for western 
    Africa.  The affected zones are: Africa/Bamako, Africa/Banjul, 
    Africa/Conakry, Africa/Dakar, Africa/Freetown, Africa/Lome, 
    Africa/Nouakchott, Africa/Ouagadougou, Africa/Sao_Tome, and 
    Atlantic/St_Helena.  This also affects the backwards-compatibility 
    link Africa/Timbuktu.  (Thanks to Alan Barrett, Stephen Colebourne, 
    Tim Parenti, and David Patte for reporting problems in earlier 
    versions of this change.) 
 
    Asia/Shanghai's pre-standard-time UT offset has been changed from 
    8:05:57 to 8:05:43, the location of Xujiahui Observatory.  Its 
    transition to standard time has been changed from 1928 to 1901. 
 
    Asia/Taipei switched to JWST on 1896-01-01, then to JST on 1937-10-01, 
    then to CST on 1945-09-21 at 01:00, and did not observe DST in 1945. 
    In 1946 it observed DST from 05-15 through 09-30; in 1947 
    from 04-15 through 10-31; and in 1979 from 07-01 through 09-30. 
    (Thanks to Yu-Cheng Chuang.) 
 
    Asia/Riyadh's transition to standard time is now 1947-03-14, not 1950. 
 
    Europe/Helsinki's 1942 fall-back transition was 10-04 at 01:00, not 
    10-03 at 00:00.  (Thanks to Konstantin Hyppönen.) 
 
    Pacific/Pago_Pago has been changed from UT -11:30 to -11 for the 
    period from 1911 to 1950. 
 
    Pacific/Chatham has been changed to New Zealand standard time plus 
    45 minutes for the period before 1957, reflecting a 1956 remark in 
    the New Zealand parliament. 
 
    Europe/Budapest has several pre-1946 corrections: in 1918 the transition 
    out of DST was on 09-16, not 09-29; in 1919 it was on 11-24, not 09-15; in 
    1945 it was on 11-01, not 11-03; in 1941 the transition to DST was 04-08 
    not 04-06 at 02:00; and there was no DST in 1920. 
 
    Africa/Accra is now assumed to have observed DST from 1920 through 1935. 
 
    Time in Russia before 1927 or so has been corrected by a few seconds in 
    the following zones: Europe/Moscow, Asia/Irkutsk, Asia/Tbilisi, 
    Asia/Tashkent, Asia/Vladivostok, Asia/Yekaterinburg, Europe/Helsinki, and 
    Europe/Riga.  Also, Moscow's location has been changed to its Kilometer 0 
    point.  (Thanks to Vladimir Karpinsky for the Moscow changes.) 
 
  Changes affecting data format 
 
    A new file 'zone1970.tab' supersedes 'zone.tab' in the installed data. 
    The new file's extended format allows multiple country codes per zone. 
    The older file is still installed but is deprecated; its format is 
    not changing and it will still be distributed for a while, but new 
    applications should use the new file. 
 
    The new file format simplifies maintenance of obscure locations. 
    To test this, it adds coverage for the Crozet Islands and the 
    Scattered Islands.  (Thanks to Tobias Conradi and Antoine Leca.) 
 
    The file 'iso3166.tab' is planned to switch from ASCII to UTF-8. 
    It is still ASCII now, but commentary about the switch has been added. 
    The new file 'zone1970.tab' already uses UTF-8. 
 
  Changes affecting code 
 
    'localtime', 'mktime', etc. now use much less stack space if ALL_STATE 
    is defined.  (Thanks to Elliott Hughes for reporting the problem.) 
 
    'zic' no longer mishandles input when ignoring case in locales that 
    are not compatible with English, e.g., unibyte Turkish locales when 
    compiled with HAVE_GETTEXT. 
 
    Error diagnostics of 'zic' and 'yearistype' have been reworded so that 
    they no longer use ASCII '-' as if it were a dash. 
 
    'zic' now rejects output file names that contain '.' or '..' components. 
    (Thanks to Tim Parenti for reporting the problem.) 
 
    'zic -v' now warns about output file names that do not follow 
    POSIX rules, or that contain a digit or '.'.  (Thanks to Arthur 
    David Olson for starting the ball rolling on this.) 
 
    Some lint has been removed when using GCC_DEBUG_FLAGS with GCC 4.9.0. 
 
  Changes affecting build procedure 
 
    'zic' no longer links in localtime.o and asctime.o, as they're not needed. 
    (Thanks to John Cochran.) 
 
  Changes affecting documentation and commentary 
 
    The 'Theory' file documents legacy names, the longstanding 
    exceptions to the POSIX-inspired file name rules. 
 
    The 'zic' documentation clarifies the role of time types when 
    interpreting dates.  (Thanks to Arthur David Olson.) 
 
    Documentation and commentary now prefer UTF-8 to US-ASCII, 
    allowing the use of proper accents in foreign words and names. 
    Code and data have not changed because of this.  (Thanks to 
    Garrett Wollman, Ian Abbott, and Guy Harris for helping to debug 
    this.) 
 
    Non-HTML documentation and commentary now use plain-text URLs instead of 
    HTML insertions, and are more consistent about bracketing URLs when they 
    are not already surrounded by white space.  (Thanks to suggestions by 
    Steffen Nurpmeso.) 
 
    There is new commentary about Xujiahui Observatory, the five time-zone 
    project in China from 1918 to 1949, timekeeping in Japanese-occupied 
    Shanghai, and Tibet Time in the 1950s.  The sharp-eyed can spot the 
    warlord Jin Shuren in the data. 
 
    Commentary about the coverage of each Russian zone has been standardized. 
    (Thanks to Tim Parenti). 
 
    There is new commentary about contemporary timekeeping in Ethiopia. 
 
    Obsolete comments about a 2007 proposal for DST in Kuwait has been removed. 
 
    There is new commentary about time in Poland in 1919. 
 
    Proper credit has been given to DST inventor George Vernon Hudson. 
 
    Commentary about time in Metlakatla, AK and Resolute, NU has been 
    improved, with a new source for the former. 
 
    In zone.tab, Pacific/Easter no longer mentions Salas y Gómez, as it 
    is uninhabited. 
 
    Commentary about permanent Antarctic bases has been updated. 
 
    Several typos have been corrected.  (Thanks to Tim Parenti for 
    contributing some of these fixes.) 
 
    tz-link.htm now mentions the JavaScript libraries Moment Timezone, 
    TimezoneJS.Date, Walltime-js, and Timezone.  (Thanks to a heads-up 
    from Matt Johnson.)  Also, it mentions the Go 'latlong' package. 
    (Thanks to a heads-up from Dirkjan Ochtman.) 
 
    The files usno1988, usno1989, usno1989a, usno1995, usno1997, and usno1998 
    have been removed.  These obsolescent US Naval Observatory entries were no 
    longer helpful for maintenance.  (Thanks to Tim Parenti for the suggestion.) 
 
 
Release 2014e - 2014-06-12 21:53:52 -0700 
 
  Changes affecting near-future timestamps 
 
    Egypt's 2014 Ramadan-based transitions are June 26 and July 31 at 24:00. 
    (Thanks to Imed Chihi.)  Guess that from 2015 on Egypt will temporarily 
    switch to standard time at 24:00 the last Thursday before Ramadan, and 
    back to DST at 00:00 the first Friday after Ramadan. 
 
    Similarly, Morocco's are June 28 at 03:00 and August 2 at 02:00.  (Thanks 
    to Milamber Space Network.)  Guess that from 2015 on Morocco will 
    temporarily switch to standard time at 03:00 the last Saturday before 
    Ramadan, and back to DST at 02:00 the first Saturday after Ramadan. 
 
  Changes affecting past timestamps 
 
    The abbreviation "MSM" (Moscow Midsummer Time) is now used instead of 
    "MSD" for Moscow's double daylight time in summer 1921.  Also, a typo 
    "VLASST" has been repaired to be "VLAST" for Vladivostok summer time 
    in 1991.  (Thanks to Hank W. for reporting the problems.) 
 
  Changes affecting commentary 
 
    tz-link.htm now cites RFC 7265 for jCal, mentions PTP and the 
    draft CalDAV extension, updates URLs for TSP, TZInfo, IATA, and 
    removes stale pointers to World Time Explorer and WORLDTIME. 
 
 
Release 2014d - 2014-05-27 21:34:40 -0700 
 
  Changes affecting code 
 
    zic no longer generates files containing timestamps before the Big Bang. 
    This works around GNOME bug 730332 
    <https://bugzilla.gnome.org/show_bug.cgi?id=730332>. 
    (Thanks to Leonardo Chiquitto for reporting the bug, and to 
    Arthur David Olson and James Cloos for suggesting improvements to the fix.) 
 
  Changes affecting documentation 
 
    tz-link.htm now mentions GNOME. 
 
 
Release 2014c - 2014-05-13 07:44:13 -0700 
 
  Changes affecting near-future timestamps 
 
    Egypt observes DST starting 2014-05-15 at 24:00. 
    (Thanks to Ahmad El-Dardiry and Gunther Vermier.) 
    Details have not been announced, except that DST will not be observed 
    during Ramadan.  Guess that DST will stop during the same Ramadan dates as 
    Morocco, and that Egypt's future spring and fall transitions will be the 
    same as 2010 when it last observed DST, namely April's last Friday at 
    00:00 to September's last Thursday at 23:00 standard time.  Also, guess 
    that Ramadan transitions will be at 00:00 standard time. 
 
  Changes affecting code 
 
    zic now generates transitions for minimum time values, eliminating guesswork 
    when handling low-valued timestamps.  (Thanks to Arthur David Olson.) 
 
    Port to Cygwin sans glibc.  (Thanks to Arthur David Olson.) 
 
  Changes affecting commentary and documentation 
 
    Remove now-confusing comment about Jordan.  (Thanks to Oleksii Nochovnyi.) 
 
 
Release 2014b - 2014-03-24 21:28:50 -0700 
 
  Changes affecting near-future timestamps 
 
    Crimea switches to Moscow time on 2014-03-30 at 02:00 local time. 
    (Thanks to Alexander Krivenyshev.)  Move its zone.tab entry from UA to RU. 
 
    New entry for Troll station, Antarctica.  (Thanks to Paul-Inge Flakstad and 
    Bengt-Inge Larsson.)  This is currently an approximation; a better version 
    will require the zic and localtime fixes mentioned below, and the plan is 
    to wait for a while until at least the zic fixes propagate. 
 
  Changes affecting code 
 
    'zic' and 'localtime' no longer reject locations needing four transitions 
    per year for the foreseeable future.  (Thanks to Andrew Main (Zefram).) 
    Also, 'zic' avoids some unlikely failures due to integer overflow. 
 
  Changes affecting build procedure 
 
    'make check' now detects Rule lines defined but never used. 
    The NZAQ rules, an instance of this problem, have been removed. 
 
  Changes affecting commentary and documentation 
 
    Fix Tuesday/Thursday typo in description of time in Israel. 
    (Thanks to Bert Katz via Pavel Kharitonov and Mike Frysinger.) 
 
    Microsoft Windows 8.1 doesn't support tz database names.  (Thanks 
    to Donald MacQueen.)  Instead, the Microsoft Windows Store app 
    library supports them. 
 
    Add comments about Johnston Island time in the 1960s. 
    (Thanks to Lyle McElhaney.) 
 
    Morocco's 2014 DST start will be as predicted. 
    (Thanks to Sebastien Willemijns.) 
 
 
Release 2014a - 2014-03-07 23:30:29 -0800 
 
  Changes affecting near-future timestamps 
 
    Turkey begins DST on 2014-03-31, not 03-30.  (Thanks to Faruk Pasin for 
    the heads-up, and to Tim Parenti for simplifying the update.) 
 
  Changes affecting past timestamps 
 
    Fiji ended DST on 2014-01-19 at 02:00, not the previously-scheduled 03:00. 
    (Thanks to Steffen Thorsen.) 
 
    Ukraine switched from Moscow to Eastern European time on 1990-07-01 
    (not 1992-01-01), and observed DST during the entire next winter. 
    (Thanks to Vladimir in Moscow via Alois Treindl.) 
 
    In 1988 Israel observed DST from 04-10 to 09-04, not 04-09 to 09-03. 
    (Thanks to Avigdor Finkelstein.) 
 
  Changes affecting code 
 
    A uninitialized-storage bug in 'localtime' has been fixed. 
    (Thanks to Logan Chien.) 
 
  Changes affecting the build procedure 
 
    The settings for 'make check_web' now default to Ubuntu 13.10. 
 
  Changes affecting commentary and documentation 
 
    The boundary of the US Pacific time zone is given more accurately. 
    (Thanks to Alan Mintz.) 
 
    Chile's 2014 DST will be as predicted.  (Thanks to José Miguel Garrido.) 
 
    Paraguay's 2014 DST will be as predicted.  (Thanks to Carlos Raúl Perasso.) 
 
    Better descriptions of countries with same time zone history as 
    Trinidad and Tobago since 1970.  (Thanks to Alan Barrett for suggestion.) 
 
    Several changes affect tz-link.htm, the main web page. 
 
      Mention Time.is (thanks to Even Scharning) and WX-now (thanks to 
      David Braverman). 
 
      Mention xCal (Internet RFC 6321) and jCal. 
 
      Microsoft has some support for tz database names. 
 
      CLDR data formats include both XML and JSON. 
 
      Mention Maggiolo's map of solar vs standard time. 
      (Thanks to Arthur David Olson.) 
 
      Mention TZ4Net.  (Thanks to Matt Johnson.) 
 
      Mention the timezone-olson Haskell package. 
 
      Mention zeitverschiebung.net.  (Thanks to Martin Jäger.) 
 
      Remove moribund links to daylight-savings-time.info and to 
      Simple Timer + Clocks. 
 
      Update two links.  (Thanks to Oscar van Vlijmen.) 
 
      Fix some formatting glitches, e.g., remove random newlines from 
      abbr elements' title attributes. 
 
 
Release 2013i - 2013-12-17 07:25:23 -0800 
 
  Changes affecting near-future timestamps: 
 
    Jordan switches back to standard time at 00:00 on December 20, 2013. 
    The 2006-2011 transition schedule is planned to resume in 2014. 
    (Thanks to Steffen Thorsen.) 
 
  Changes affecting past timestamps: 
 
    In 2004, Cuba began DST on March 28, not April 4. 
    (Thanks to Steffen Thorsen.) 
 
  Changes affecting code 
 
    The compile-time flag NOSOLAR has been removed, as nowadays the 
    benefit of slightly shrinking runtime table size is outweighed by the 
    cost of disallowing potential future updates that exceed old limits. 
 
  Changes affecting documentation and commentary 
 
    The files solar87, solar88, and solar89 are no longer distributed. 
    They were a negative experiment - that is, a demonstration that 
    tz data can represent solar time only with some difficulty and error. 
    Their presence in the distribution caused confusion, as Riyadh 
    civil time was generally not solar time in those years. 
 
    tz-link.htm now mentions Noda Time.  (Thanks to Matt Johnson.) 
 
 
Release 2013h - 2013-10-25 15:32:32 -0700 
 
  Changes affecting current and future timestamps: 
 
    Libya has switched its UT offset back to +02 without DST, instead 
    of +01 with DST.  (Thanks to Even Scharning.) 
 
    Western Sahara (Africa/El_Aaiun) uses Morocco's DST rules. 
    (Thanks to Gwillim Law.) 
 
  Changes affecting future timestamps: 
 
    Acre and (we guess) western Amazonas will switch from UT -04 to -05 
    on 2013-11-10.  This affects America/Rio_Branco and America/Eirunepe. 
    (Thanks to Steffen Thorsen.) 
 
    Add entries for DST transitions in Morocco in the year 2038. 
    This avoids some year-2038 glitches introduced in 2013g. 
    (Thanks to Yoshito Umaoka for reporting the problem.) 
 
  Changes affecting API 
 
    The 'tzselect' command no longer requires the 'select' command, 
    and should now work with /bin/sh on more platforms.  It also works 
    around a bug in BusyBox awk before version 1.21.0.  (Thanks to 
    Patrick 'P. J.' McDermott and Alan Barrett.) 
 
  Changes affecting code 
 
    Fix localtime overflow bugs with 32-bit unsigned time_t. 
 
    zdump no longer assumes sscanf returns maximal values on overflow. 
 
  Changes affecting the build procedure 
 
    The builder can specify which programs to use, if any, instead of 
    'ar' and 'ranlib', and libtz.a is now built locally before being 
    installed.  (Thanks to Michael Forney.) 
 
    A dependency typo in the 'zdump' rule has been fixed. 
    (Thanks to Andrew Paprocki.) 
 
    The Makefile has been simplified by assuming that 'mkdir -p' and 'cp -f' 
    work as specified by POSIX.2-1992 or later; this is portable nowadays. 
 
    'make clean' no longer removes 'leapseconds', since it's 
    host-independent and is part of the distribution. 
 
    The unused makefile macros TZCSRCS, TZDSRCS, DATESRCS have been removed. 
 
  Changes affecting documentation and commentary 
 
    tz-link.htm now mentions TC TIMEZONE's draft time zone service protocol 
    (thanks to Mike Douglass) and TimezoneJS.Date (thanks to Jim Fehrle). 
 
    Update URLs in tz-link page.  Add URLs for Microsoft Windows, since 
    8.1 introduces tz support.  Remove URLs for Tru64 and UnixWare (no 
    longer maintained) and for old advisories.  SOFA now does C. 
 
Release 2013g - 2013-09-30 21:08:26 -0700 
 
  Changes affecting current and near-future timestamps 
 
    Morocco now observes DST from the last Sunday in March to the last 
    Sunday in October, not April to September respectively.  (Thanks 
    to Steffen Thorsen.) 
 
  Changes affecting 'zic' 
 
    'zic' now runs on platforms that lack both hard links and symlinks. 
    (Thanks to Theo Veenker for reporting the problem, for MinGW.) 
    Also, fix some bugs on platforms that lack hard links but have symlinks. 
 
    'zic -v' again warns that Asia/Tehran has no POSIX environment variable 
    to predict the far future, fixing a bug introduced in 2013e. 
 
  Changes affecting the build procedure 
 
    The 'leapseconds' file is again put into the tzdata tarball. 
    Also, 'leapseconds.awk', so tzdata is self-contained.  (Thanks to 
    Matt Burgess and Ian Abbott.)  The timestamps of these and other 
    dependent files in tarballs are adjusted more consistently. 
 
  Changes affecting documentation and commentary 
 
    The README file is now part of the data tarball as well as the code. 
    It now states that files are public domain unless otherwise specified. 
    (Thanks to Andrew Main (Zefram) for asking for clarifications.) 
    Its details about the 1989 release moved to a place of honor near 
    the end of NEWS. 
 
 
Release 2013f - 2013-09-24 23:37:36 -0700 
 
  Changes affecting near-future timestamps 
 
    Tocantins will very likely not observe DST starting this spring. 
    (Thanks to Steffen Thorsen.) 
 
    Jordan will likely stay at UT +03 indefinitely, and will not fall 
    back this fall. 
 
    Palestine will fall back at 00:00, not 01:00.  (Thanks to Steffen Thorsen.) 
 
  Changes affecting API 
 
    The types of the global variables 'timezone' and 'altzone' (if present) 
    have been changed back to 'long'.  This is required for 'timezone' 
    by POSIX, and for 'altzone' by common practice, e.g., Solaris 11. 
    These variables were originally 'long' in the tz code, but were 
    mistakenly changed to 'time_t' in 1987; nobody reported the 
    incompatibility until now.  The difference matters on x32, where 
    'long' is 32 bits and 'time_t' is 64.  (Thanks to Elliott Hughes.) 
 
  Changes affecting the build procedure 
 
    Avoid long strings in leapseconds.awk to work around a mawk bug. 
    (Thanks to Cyril Baurand.) 
 
  Changes affecting documentation and commentary 
 
    New file 'NEWS' that contains release notes like this one. 
 
    Paraguay's law does not specify DST transition time; 00:00 is customary. 
    (Thanks to Waldemar Villamayor-Venialbo.) 
 
    Minor capitalization fixes. 
 
  Changes affecting version-control only 
 
    The experimental GitHub repository now contains annotated and 
    signed tags for recent releases, e.g., '2013e' for Release 2013e. 
    Releases are tagged starting with 2012e; earlier releases were 
    done differently, and tags would either not have a simple name or 
    not exactly match what was released. 
 
    'make set-timestamps' is now simpler and a bit more portable. 
 
 
Release 2013e - 2013-09-19 23:50:04 -0700 
 
  Changes affecting near-future timestamps 
 
    This year Fiji will start DST on October 27, not October 20. 
    (Thanks to David Wheeler for the heads-up.)  For now, guess that 
    Fiji will continue to spring forward the Sunday before the fourth 
    Monday in October. 
 
  Changes affecting current and future time zone abbreviations 
 
    Use WIB/WITA/WIT rather than WIT/CIT/EIT for alphabetic Indonesian 
    time zone abbreviations since 1932.  (Thanks to George Ziegler, 
    Priyadi Iman Nurcahyo, Zakaria, Jason Grimes, Martin Pitt, and 
    Benny Lin.)  This affects Asia/Dili, Asia/Jakarta, Asia/Jayapura, 
    Asia/Makassar, and Asia/Pontianak. 
 
    Use ART (UT -03, standard time), rather than WARST (also -03, but 
    daylight saving time) for San Luis, Argentina since 2009. 
 
  Changes affecting Godthåb timestamps after 2037 if version mismatch 
 
    Allow POSIX-like TZ strings where the transition time's hour can 
    range from -167 through 167, instead of the POSIX-required 0 
    through 24.  E.g., TZ='FJT-12FJST,M10.3.1/146,M1.3.4/75' for the 
    new Fiji rules.  This is a more-compact way to represent 
    far-future timestamps for America/Godthab, America/Santiago, 
    Antarctica/Palmer, Asia/Gaza, Asia/Hebron, Asia/Jerusalem, 
    Pacific/Easter, and Pacific/Fiji.  Other zones are unaffected by 
    this change.  (Derived from a suggestion by Arthur David Olson.) 
 
    Allow POSIX-like TZ strings where daylight saving time is in 
    effect all year.  E.g., TZ='WART4WARST,J1/0,J365/25' for Western 
    Argentina Summer Time all year.  This supports a more-compact way 
    to represent the 2013d data for America/Argentina/San_Luis. 
    Because of the change for San Luis noted above this change does not 
    affect the current data.  (Thanks to Andrew Main (Zefram) for 
    suggestions that improved this change.) 
 
    Where these two TZ changes take effect, there is a minor extension 
    to the tz file format in that it allows new values for the 
    embedded TZ-format string, and the tz file format version number 
    has therefore been increased from 2 to 3 as a precaution. 
    Version-2-based client code should continue to work as before for 
    all timestamps before 2038.  Existing version-2-based client code 
    (tzcode, GNU/Linux, Solaris) has been tested on version-3-format 
    files, and typically works in practice even for timestamps after 
    2037; the only known exception is America/Godthab. 
 
  Changes affecting timestamps before 1970 
 
    Pacific/Johnston is now a link to Pacific/Honolulu.  This corrects 
    some errors before 1947. 
 
    Some zones have been turned into links, when they differ from existing 
    zones only in older data entries that were likely invented or that 
    differ only in LMT or transitions from LMT.  These changes affect 
    only timestamps before 1943.  The affected zones are: 
    Africa/Juba, America/Anguilla, America/Aruba, America/Dominica, 
    America/Grenada, America/Guadeloupe, America/Marigot, 
    America/Montserrat, America/St_Barthelemy, America/St_Kitts, 
    America/St_Lucia, America/St_Thomas, America/St_Vincent, 
    America/Tortola, and Europe/Vaduz.  (Thanks to Alois Treindl for 
    confirming that the old Europe/Vaduz zone was wrong and the new 
    link is better for WWII-era times.) 
 
    Change Kingston Mean Time from -5:07:12 to -5:07:11.  This affects 
    America/Cayman, America/Jamaica and America/Grand_Turk timestamps 
    from 1890 to 1912. 
 
    Change the UT offset of Bern Mean Time from 0:29:44 to 0:29:46. 
    This affects Europe/Zurich timestamps from 1853 to 1894.  (Thanks 
    to Alois Treindl). 
 
    Change the date of the circa-1850 Zurich transition from 1849-09-12 
    to 1853-07-16, overriding Shanks with data from Messerli about 
    postal and telegraph time in Switzerland. 
 
  Changes affecting time zone abbreviations before 1970 
 
    For Asia/Jakarta, use BMT (not JMT) for mean time from 1923 to 1932, 
    as Jakarta was called Batavia back then. 
 
  Changes affecting API 
 
    The 'zic' command now outputs a dummy transition when far-future 
    data can't be summarized using a TZ string, and uses a 402-year 
    window rather than a 400-year window.  For the current data, this 
    affects only the Asia/Tehran file.  It does not affect any of the 
    timestamps that this file represents, so zdump outputs the same 
    information as before.  (Thanks to Andrew Main (Zefram).) 
 
    The 'date' command has a new '-r' option, which lets you specify 
    the integer time to display, a la FreeBSD. 
 
    The 'tzselect' command has two new options '-c' and '-n', which lets you 
    select a zone based on latitude and longitude. 
 
    The 'zic' command's '-v' option now warns about constructs that 
    require the new version-3 binary file format.  (Thanks to Arthur 
    David Olson for the suggestion.) 
 
    Support for floating-point time_t has been removed. 
    It was always dicey, and POSIX no longer requires it. 
    (Thanks to Eric Blake for suggesting to the POSIX committee to 
    remove it, and thanks to Alan Barrett, Clive D.W. Feather, Andy 
    Heninger, Arthur David Olson, and Alois Treindl, for reporting 
    bugs and elucidating some of the corners of the old floating-point 
    implementation.) 
 
    The signatures of 'offtime', 'timeoff', and 'gtime' have been 
    changed back to the old practice of using 'long' to represent UT 
    offsets.  This had been inadvertently and mistakenly changed to 
    'int_fast32_t'.  (Thanks to Christos Zoulas.) 
 
    The code avoids undefined behavior on integer overflow in some 
    more places, including gmtime, localtime, mktime and zdump. 
 
  Changes affecting the zdump utility 
 
    zdump now outputs "UT" when referring to Universal Time, not "UTC". 
    "UTC" does not make sense for timestamps that predate the introduction 
    of UTC, whereas "UT", a more-generic term, does.  (Thanks to Steve Allen 
    for clarifying UT vs UTC.) 
 
  Data changes affecting behavior of tzselect and similar programs 
 
    Country code BQ is now called the more-common name "Caribbean Netherlands" 
    rather than the more-official "Bonaire, St Eustatius & Saba". 
 
    Remove from zone.tab the names America/Montreal, America/Shiprock, 
    and Antarctica/South_Pole, as they are equivalent to existing 
    same-country-code zones for post-1970 timestamps.  The data entries for 
    these names are unchanged, so the names continue to work as before. 
 
  Changes affecting code internals 
 
    zic -c now runs way faster on 64-bit hosts when given large numbers. 
 
    zic now uses vfprintf to avoid allocating and freeing some memory. 
 
    tzselect now computes the list of continents from the data, 
    rather than have it hard-coded. 
 
    Minor changes pacify GCC 4.7.3 and GCC 4.8.1. 
 
  Changes affecting the build procedure 
 
    The 'leapseconds' file is now generated automatically from a 
    new file 'leap-seconds.list', which is a copy of 
    <ftp://ftp.nist.gov/pub/time/leap-seconds.list> 
    A new source file 'leapseconds.awk' implements this. 
    The goal is simplification of the future maintenance of 'leapseconds'. 
 
    When building the 'posix' or 'right' subdirectories, if the 
    subdirectory would be a copy of the default subdirectory, it is 
    now made a symbolic link if that is supported.  This saves about 
    2 MB of file system space. 
 
    The links America/Shiprock and Antarctica/South_Pole have been 
    moved to the 'backward' file.  This affects only nondefault builds 
    that omit 'backward'. 
 
  Changes affecting version-control only 
 
    .gitignore now ignores 'date'. 
 
  Changes affecting documentation and commentary 
 
    Changes to the 'tzfile' man page 
 
      It now mentions that the binary file format may be extended in 
      future versions by appending data. 
 
      It now refers to the 'zdump' and 'zic' man pages. 
 
    Changes to the 'zic' man page 
 
      It lists conditions that elicit a warning with '-v'. 
 
      It says that the behavior is unspecified when duplicate names 
      are given, or if the source of one link is the target of another. 
 
      Its examples are updated to match the latest data. 
 
      The definition of white space has been clarified slightly. 
      (Thanks to Michael Deckers.) 
 
    Changes to the 'Theory' file 
 
      There is a new section about the accuracy of the tz database, 
      describing the many ways that errors can creep in, and 
      explaining why so many of the pre-1970 timestamps are wrong or 
      misleading (thanks to Steve Allen, Lester Caine, and Garrett 
      Wollman for discussions that contributed to this). 
 
      The 'Theory' file describes LMT better (this follows a 
      suggestion by Guy Harris). 
 
      It refers to the 2013 edition of POSIX rather than the 2004 edition. 
 
      It's mentioned that excluding 'backward' should not affect the 
      other data, and it suggests at least one zone.tab name per 
      inhabited country (thanks to Stephen Colebourne). 
 
      Some longstanding restrictions on names are documented, e.g., 
      'America/New_York' precludes 'America/New_York/Bronx'. 
 
      It gives more reasons for the 1970 cutoff. 
 
      It now mentions which time_t variants are supported, such as 
      signed integer time_t.  (Thanks to Paul Goyette for reporting 
      typos in an experimental version of this change.) 
 
      (Thanks to Philip Newton for correcting typos in these changes.) 
 
    Documentation and commentary is more careful to distinguish UT in 
    general from UTC in particular.  (Thanks to Steve Allen.) 
 
    Add a better source for the Zurich 1894 transition. 
    (Thanks to Pierre-Yves Berger.) 
 
    Update shapefile citations in tz-link.htm.  (Thanks to Guy Harris.) 
 
 
Release 2013d - 2013-07-05 07:38:01 -0700 
 
  Changes affecting future timestamps: 
 
    Morocco's midsummer transitions this year are July 7 and August 10, 
    not July 9 and August 8.  (Thanks to Andrew Paprocki.) 
 
    Israel now falls back on the last Sunday of October. 
    (Thanks to Ephraim Silverberg.) 
 
  Changes affecting past timestamps: 
 
    Specify Jerusalem's location more precisely; this changes the pre-1880 
    times by 2 s. 
 
  Changing affecting metadata only: 
 
    Fix typos in the entries for country codes BQ and SX. 
 
  Changes affecting code: 
 
    Rework the code to fix a bug with handling Australia/Macquarie on 
    32-bit hosts (thanks to Arthur David Olson). 
 
    Port to platforms like NetBSD, where time_t can be wider than long. 
 
    Add support for testing time_t types other than the system's. 
    Run 'make check_time_t_alternatives' to try this out. 
    Currently, the tests fail for unsigned time_t; 
    this should get fixed at some point. 
 
  Changes affecting documentation and commentary: 
 
    Deemphasize the significance of national borders. 
 
    Update the zdump man page. 
 
    Remove obsolete NOID comment (thanks to Denis Excoffier). 
 
    Update several URLs and comments in the web pages. 
 
    Spelling fixes (thanks to Kevin Lyda and Jonathan Leffler). 
 
    Update URL for CLDR Zone->Tzid table (thanks to Yoshito Umaoka). 
 
 
Release 2013c - 2013-04-19 16:17:40 -0700 
 
  Changes affecting current and future timestamps: 
 
    Palestine observed DST starting March 29, 2013.  (Thanks to 
    Steffen Thorsen.)  From 2013 on, Gaza and Hebron both observe DST, 
    with the predicted rules being the last Thursday in March at 24:00 
    to the first Friday on or after September 21 at 01:00. 
 
    Assume that the recent change to Paraguay's DST rules is permanent, 
    by moving the end of DST to the 4th Sunday in March every year. 
    (Thanks to Carlos Raúl Perasso.) 
 
  Changes affecting past timestamps: 
 
    Fix some historical data for Palestine to agree with that of 
    timeanddate.com, as follows: 
 
          The spring 2008 change in Gaza and Hebron was on 00:00 Mar 28, not 
          00:00 Apr 1. 
 
          The fall 2009 change in Gaza and Hebron on Sep 4 was at 01:00, not 
          02:00. 
 
          The spring 2010 change in Hebron was 00:00 Mar 26, not 00:01 Mar 27. 
 
          The spring 2011 change in Gaza was 00:01 Apr 1, not 12:01 Apr 2. 
 
          The spring 2011 change in Hebron on Apr 1 was at 00:01, not 12:01. 
 
          The fall 2011 change in Hebron on Sep 30 was at 00:00, not 03:00. 
 
    Fix times of habitation for Macquarie to agree with the Tasmania 
    Parks & Wildlife Service history, which indicates that permanent 
    habitation was 1899-1919 and 1948 on. 
 
  Changing affecting metadata only: 
 
    Macquarie Island is politically part of Australia, not Antarctica. 
    (Thanks to Tobias Conradi.) 
 
    Sort Macquarie more-consistently with other parts of Australia. 
    (Thanks to Tim Parenti.) 
 
 
Release 2013b - 2013-03-10 22:33:40 -0700 
 
  Changes affecting current and future timestamps: 
 
    Haiti uses US daylight-saving rules this year, and presumably future years. 
    This changes timestamps starting today.  (Thanks to Steffen Thorsen.) 
 
    Paraguay will end DST on March 24 this year. 
    (Thanks to Steffen Thorsen.)  For now, assume it's just this year. 
 
    Morocco does not observe DST during Ramadan; 
    try to predict Ramadan in Morocco as best we can. 
    (Thanks to Erik Homoet for the heads-up.) 
 
  Changes affecting commentary: 
 
    Update URLs in tz-link page.  Add URLs for webOS, BB10, iOS. 
    Update URL for Solaris.  Mention Internet RFC 6557. 
    Update Internet RFCs 2445->5545, 2822->5322. 
    Switch from FTP to HTTP for Internet RFCs. 
 
 
Release 2013a - 2013-02-27 09:20:35 -0800 
 
  Change affecting binary data format: 
 
    The zone offset at the end of version-2-format zone files is now 
    allowed to be 24:00, as per POSIX.1-2008.  (Thanks to Arthur David Olson.) 
 
  Changes affecting current and future timestamps: 
 
    Chile's 2013 rules, and we guess rules for 2014 and later, will be 
    the same as 2012, namely Apr Sun>=23 03:00 UTC to Sep Sun>=2 04:00 UTC. 
    (Thanks to Steffen Thorsen and Robert Elz.) 
 
    New Zones Asia/Khandyga, Asia/Ust-Nera, Europe/Busingen. 
    (Thanks to Tobias Conradi and Arthur David Olson.) 
 
  Many changes affect historical timestamps before 1940. 
  These were deduced from: Milne J. Civil time. Geogr J. 1899 
  Feb;13(2):173-94 <https://www.jstor.org/stable/1774359>. 
 
  Changes affecting the code: 
 
    Fix zic bug that mishandled Egypt's 2010 changes (this also affected 
    the data).  (Thanks to Arthur David Olson.) 
 
    Fix localtime bug when time_t is unsigned and data files were generated 
    by a signed time_t system.  (Thanks to Doug Bailey for reporting and 
    to Arthur David Olson for fixing.) 
 
    Allow the email address for bug reports to be set by the packager. 
    The default is tz@iana.org, as before.  (Thanks to Joseph S. Myers.) 
 
    Update HTML checking to be compatible with Ubuntu 12.10. 
 
    Check that files are a safe subset of ASCII.  At some point we may 
    relax this requirement to a safe subset of UTF-8.  Without the 
    check, some non-UTF-8 encodings were leaking into the distribution. 
 
  Commentary changes: 
 
    Restore a comment about copyright notices that was inadvertently deleted. 
    (Thanks to Arthur David Olson.) 
 
    Improve the commentary about which districts observe what times 
    in Russia.  (Thanks to Oscar van Vlijmen and Arthur David Olson). 
 
    Add web page links to tz.js. 
 
    Add "Run by the Monkeys" to tz-art.  (Thanks to Arthur David Olson.) 
 
 
Release 2012j - 2012-11-12 18:34:49 -0800 
 
  Libya moved to CET this weekend, but with DST planned next year. 
  (Thanks to Even Scharning, Steffen Thorsen, and Tim Parenti.) 
 
  Signatures now have the extension .asc, not .sign, as that's more 
  standard.  (Thanks to Phil Pennock.) 
 
  The output of 'zdump --version', and of 'zic --version', now 
  uses a format that is more typical for --version. 
  (Thanks to Joseph S. Myers.) 
 
  The output of 'tzselect --help', 'zdump --help', and 'zic --help' 
  now uses tz@iana.org rather than the old elsie address. 
 
  zic -v now complains about abbreviations that are less than 3 
  or more than 6 characters, as per Posix.  Formerly, it checked 
  for abbreviations that were more than 3. 
 
  'make public' no longer puts its temporary directory under /tmp, 
  and uses the just-built zic rather than the system zic. 
 
  Various fixes to documentation and commentary. 
 
 
Release 2012i - 2012-11-03 12:57:09 -0700 
 
  Cuba switches from DST tomorrow at 01:00.  (Thanks to Steffen Thorsen.) 
 
  Linker flags can now be specified via LDFLAGS. 
  AWK now defaults to 'awk', not 'nawk'. 
  The shell in tzselect now defaults to /bin/bash, but this can 
  be overridden by specifying KSHELL. 
  The main web page now mentions the unofficial GitHub repository. 
  (Thanks to Mike Frysinger.) 
 
  Tarball signatures can now be built by running 'make signatures'. 
  There are also new makefile rules 'tarballs', 'check_public', and 
  separate makefile rules for each tarball and signature file. 
  A few makefile rules are now more portable to strict POSIX. 
 
  The main web page now lists the canonical IANA URL. 
 
 
Release 2012h - 2012-10-26 22:49:10 -0700 
 
  Bahia no longer has DST.  (Thanks to Kelley Cook.) 
 
  Tocantins has DST.  (Thanks to Rodrigo Severo.) 
 
  Israel has new DST rules next year.  (Thanks to Ephraim Silverberg.) 
 
  Jordan stays on DST this winter.  (Thanks to Steffen Thorsen.) 
 
  Web page updates. 
 
  More C modernization, except that at Arthur David Olson's suggestion 
  the instances of 'register' were kept. 
 
 
Release 2012g - 2012-10-17 20:59:45 -0700 
 
  Samoa fall 2012 and later.  (Thanks to Nicholas Pereira and Robert Elz.) 
 
  Palestine fall 2012.  (Thanks to Steffen Thorsen.) 
 
  Assume C89. 
 
  To attack the version-number problem, this release ships the file 
  'Makefile' (which contains the release number) in both the tzcode and 
  the tzdata tarballs.  The two Makefiles are identical, and should be 
  identical in any matching pair of tarballs, so it shouldn't matter 
  which order you extract the tarballs.  Perhaps we can come up with a 
  better version-number scheme at some point; this scheme does have the 
  virtue of not adding more files. 
 
 
Release 2012f - 2012-09-12 23:17:03 -0700 
 
  * australasia (Pacific/Fiji): Fiji DST is October 21 through January 
    20 this year.  (Thanks to Steffen Thorsen.) 
 
 
Release 2012e - 2012-08-02 20:44:55 -0700 
 
  * australasia (Pacific/Fakaofo): Tokelau is UT +13, not +14. 
    (Thanks to Steffen Thorsen.) 
 
  * Use a single version number for both code and data. 
 
  * .gitignore: New file. 
 
  * Remove trailing white space. 
 
 
Release code2012c-data2012d - 2012-07-19 16:35:33 -0700 
 
  Changes for Morocco's timestamps, which take effect in a couple of 
  hours, along with infrastructure changes to accommodate how the tz 
  code and data are released on IANA. 
 
 
Release data2012c - 2012-03-27 12:17:25 -0400 
 
  africa 
        Summer time changes for Morocco (to start late April 2012) 
 
  asia 
        Changes for 2012 for Gaza & the West Bank (Hebron) and Syria 
 
  northamerica 
        Haiti following US/Canada rules for 2012 (and we're assuming, 
        for now anyway, for the future). 
 
 
Release 2012b - 2012-03-02 12:29:15 +0700 
 
  There is just one change to tzcode2012b (compared with 2012a): 
  the Makefile that was accidentally included with 2012a has been 
  replaced with the version that should have been there, which is 
  identical with the previous version (from tzcode2011i). 
 
  There are just two changes in tzdata2012b compared with 2012a. 
 
  Most significantly, summer time in Cuba has been delayed 3 weeks 
  (now starts April 1 rather than March 11).   Since Mar 11 (the old start 
  date, as listed in 2012a) is just a little over a week away, this 
  change is urgent. 
 
  Less importantly, an excess tab in one of the changes in zone.tab 
  in 2012a has been removed. 
 
 
Release 2012a - 2012-03-01 18:28:10 +0700 
 
  The changes in tzcode2012a (compared to the previous version, 2011i) 
  are entirely to the README and tz-art.htm and tz-link.htm files, if 
  none of those concern you, you can ignore the code update.  The changes 
  reflect the changed addresses for the mailing list and the code and 
  data distribution points & methods (and a link to DateTime::TimeZone::Tzfile 
  has been added to tz-link.htm). 
 
  In tzdata2012a (compared to the previous release, which was 2011n) 
  the major changes are: 
        Chile 2011/2012 and 2012/2013 summer time date adjustments. 
        Falkland Islands onto permanent summer time (we're assuming for the 
                foreseeable future, though 2012 is all we're fairly certain of.) 
        Armenia has abolished Summer Time. 
        Tokelau jumped the International Date Line back last December 
                (just the same as their near neighbour, Samoa). 
        America/Creston is a new zone for a small area of British Columbia 
        There will be a leapsecond 2012-06-30 23:59:60 UTC. 
 
  Other minor changes are: 
        Corrections to 1918 Canadian summer time end dates. 
        Updated URL for UK time zone history (in comments) 
        A few typos in Le Corre's list of free French place names (comments) 
 
 
Release data2011n - 2011-10-30 14:57:54 +0700 
 
  There are three changes of note - most urgently, Cuba (America/Havana) 
  has extended summer time by two weeks, now to end on Nov 13, rather than 
  the (already past) Oct 30.   Second, the Pridnestrovian Moldavian Republic 
  (Europe/Tiraspol) decided not to split from the rest of Moldova after 
  all, and consequently that zone has been removed (again) and reinstated 
  in the "backward" file as a link to Europe/Chisinau.   And third, the 
  end date for Fiji's summer time this summer was moved forward from the 
  earlier planned Feb 26, to Jan 22. 
 
  Apart from that, Moldova (MD) returns to a single entry in zone.tab 
  (and the incorrect syntax that was in the 2011m version of that file 
  is so fixed - it would have been fixed in a different way had this 
  change not happened - that's the "missing" sccs version id). 
 
 
Release data2011m - 2011-10-24 21:42:16 +0700 
 
  In particular, the typos in comments in the data (2011-11-17 should have 
  been 2011-10-17 as Alan Barrett noted, and spelling of Tiraspol that 
  Tim Parenti noted) have been fixed, and the change for Ukraine has been 
  made in all 4 Ukrainian zones, rather than just Kiev (again, thanks to 
  Tim Parenti, and also Denys Gavrysh) 
 
  In addition, I added Europe/Tiraspol to zone.tab. 
 
  This time, all the files have new version numbers...  (including the files 
  otherwise unchanged in 2011m that were changed in 2011l but didn't get new 
  version numbers there...) 
 
 
Release data2011l - 2011-10-10 11:15:43 +0700 
 
  There are just 2 changes that cause different generated tzdata files from 
  zic, to Asia/Hebron and Pacific/Fiji - the possible change for Bahia, Brazil 
  is included, but commented out.  Compared with the diff I sent out last week, 
  this version also includes attributions for the sources for the changes 
  (in much the same format as ado used, but the html tags have not been 
  checked, verified, or used in any way at all, so if there are errors there, 
  please let me know.) 
 
 
Release data2011k - 2011-09-20 17:54:03 -0400 
 
  [not summarized] 
 
 
Release data2011j - 2011-09-12 09:22:49 -0400 
 
  (contemporary changes for Samoa; past changes for Kenya, Uganda, and 
  Tanzania); there are also two spelling corrections to comments in 
  the australasia file (with thanks to Christos Zoulas). 
 
 
Release 2011i - 2011-08-29 05:56:32 -0400 
 
  [not summarized] 
 
 
Release data2011h - 2011-06-15 18:41:48 -0400 
 
  Russia and Curaçao changes 
 
 
Release 2011g - 2011-04-25 09:07:22 -0400 
 
  update the rules for Egypt to reflect its abandonment of DST this year 
 
 
Release 2011f - 2011-04-06 17:14:53 -0400 
 
  [not summarized] 
 
 
Release 2011e - 2011-03-31 16:04:38 -0400 
 
  Morocco, Chile, and tz-link changes 
 
 
Release 2011d - 2011-03-14 09:18:01 -0400 
 
  changes that impact present-day timestamps in Cuba, Samoa, and Turkey 
 
 
Release 2011c - 2011-03-07 09:30:09 -0500 
 
  These do affect current timestamps in Chile and Annette Island, Canada. 
 
 
Release 2011b - 2011-02-07 08:44:50 -0500 
 
  [not summarized] 
 
 
Release 2011a - 2011-01-24 10:30:16 -0500 
 
  [not summarized] 
 
 
Release data2010o - 2010-11-01 09:18:23 -0400 
 
  change to the end of DST in Fiji in 2011 
 
 
Release 2010n - 2010-10-25 08:19:17 -0400 
 
  [not summarized] 
 
 
Release 2010m - 2010-09-27 09:24:48 -0400 
 
  Hong Kong, Vostok, and zic.c changes 
 
 
Release 2010l - 2010-08-16 06:57:25 -0400 
 
  [not summarized] 
 
 
Release 2010k - 2010-07-26 10:42:27 -0400 
 
  [not summarized] 
 
 
Release 2010j - 2010-05-10 09:07:48 -0400 
 
  changes for Bahía de Banderas and for version naming 
 
 
Release data2010i - 2010-04-16 18:50:45 -0400 
 
  the end of DST in Morocco on 2010-08-08 
 
 
Release data2010h - 2010-04-05 09:58:56 -0400 
 
  [not summarized] 
 
 
Release data2010g - 2010-03-24 11:14:53 -0400 
 
  [not summarized] 
 
 
Release 2010f - 2010-03-22 09:45:46 -0400 
 
  [not summarized] 
 
 
Release data2010e - 2010-03-08 14:24:27 -0500 
 
  corrects the Dhaka bug found by Danvin Ruangchan 
 
 
Release data2010d - 2010-03-06 07:26:01 -0500 
 
  [not summarized] 
 
 
Release 2010c - 2010-03-01 09:20:58 -0500 
 
  changes including KRE's suggestion for earlier initialization of 
  "goahead" and "goback" structure elements 
 
 
Release code2010a - 2010-02-16 10:40:04 -0500 
 
  [not summarized] 
 
 
Release data2010b - 2010-01-20 12:37:01 -0500 
 
  Mexico changes 
 
 
Release data2010a - 2010-01-18 08:30:04 -0500 
 
  changes to Dhaka 
 
 
Release data2009u - 2009-12-26 08:32:28 -0500 
 
  changes to DST in Bangladesh 
 
 
Release 2009t - 2009-12-21 13:24:27 -0500 
 
  [not summarized] 
 
 
Release data2009s - 2009-11-14 10:26:32 -0500 
 
  (cosmetic) Antarctica change and the DST-in-Fiji-in-2009-and-2010 change 
 
 
Release 2009r - 2009-11-09 10:10:31 -0500 
 
  "antarctica" and "tz-link.htm" changes 
 
 
Release 2009q - 2009-11-02 09:12:40 -0500 
 
  with two corrections as reported by Eric Muller and Philip Newton 
 
 
Release data2009p - 2009-10-23 15:05:27 -0400 
 
  Argentina (including San Luis) changes (with the correction from 
  Mariano Absatz) 
 
 
Release data2009o - 2009-10-14 16:49:38 -0400 
 
  Samoa (commentary only), Pakistan, and Bangladesh changes 
 
 
Release data2009n - 2009-09-22 15:13:38 -0400 
 
  added commentary for Argentina and a change to the end of DST in 
  2009 in Pakistan 
 
 
Release data2009m - 2009-09-03 10:23:43 -0400 
 
  Samoa and Palestine changes 
 
 
Release data2009l - 2009-08-14 09:13:07 -0400 
 
  Samoa (comments only) and Egypt 
 
 
Release 2009k - 2009-07-20 09:46:08 -0400 
 
  [not summarized] 
 
 
Release data2009j - 2009-06-15 06:43:59 -0400 
 
  Bangladesh change (with a short turnaround since the DST change is 
  impending) 
 
 
Release 2009i - 2009-06-08 09:21:22 -0400 
 
  updating for DST in Bangladesh this year 
 
 
Release 2009h - 2009-05-26 09:19:14 -0400 
 
  [not summarized] 
 
 
Release data2009g - 2009-04-20 16:34:07 -0400 
 
  Cairo 
 
 
Release data2009f - 2009-04-10 11:00:52 -0400 
 
  correct DST in Pakistan 
 
 
Release 2009e - 2009-04-06 09:08:11 -0400 
 
  [not summarized] 
 
 
Release 2009d - 2009-03-23 09:38:12 -0400 
 
  Morocco, Tunisia, Argentina, and American Astronomical Society changes 
 
 
Release data2009c - 2009-03-16 09:47:51 -0400 
 
  change to the start of Cuban DST 
 
 
Release 2009b - 2009-02-09 11:15:22 -0500 
 
  [not summarized] 
 
 
Release 2009a - 2009-01-21 10:09:39 -0500 
 
  [not summarized] 
 
 
Release data2008i - 2008-10-21 12:10:25 -0400 
 
  southamerica and zone.tab files, with Argentina DST rule changes and 
  United States zone reordering and recommenting 
 
 
Release 2008h - 2008-10-13 07:33:56 -0400 
 
  [not summarized] 
 
 
Release 2008g - 2008-10-06 09:03:18 -0400 
 
  Fix a broken HTML anchor and update Brazil's DST transitions; 
  there's also a slight reordering of information in tz-art.htm. 
 
 
Release data2008f - 2008-09-09 22:33:26 -0400 
 
  [not summarized] 
 
 
Release 2008e - 2008-07-28 14:11:17 -0400 
 
  changes by Arthur David Olson and Jesper Nørgaard Welen 
 
 
Release data2008d - 2008-07-07 09:51:38 -0400 
 
  changes by Arthur David Olson, Paul Eggert, and Rodrigo Severo 
 
 
Release data2008c - 2008-05-19 17:48:03 -0400 
 
  Pakistan, Morocco, and Mongolia 
 
 
Release data2008b - 2008-03-24 08:30:59 -0400 
 
  including renaming Asia/Calcutta to Asia/Kolkata, with a backward 
  link provided 
 
 
Release 2008a - 2008-03-08 05:42:16 -0500 
 
  [not summarized] 
 
 
Release 2007k - 2007-12-31 10:25:22 -0500 
 
  most importantly, changes to the "southamerica" file based on 
  Argentina's readoption of daylight saving time 
 
 
Release 2007j - 2007-12-03 09:51:01 -0500 
 
  1. eliminate the "P" (parameter) macro; 
 
  2. the "noncontroversial" changes circulated on the time zone 
  mailing list (less the changes to "logwtmp.c"); 
 
  3. eliminate "too many transition" errors when "min" is used in time 
  zone rules; 
 
  4. changes by Paul Eggert (including updated information for Venezuela). 
 
 
Release data2007i - 2007-10-30 10:28:11 -0400 
 
  changes for Cuba and Syria 
 
 
Release 2007h - 2007-10-01 10:05:51 -0400 
 
  changes by Paul Eggert, as well as an updated link to the ICU 
  project in tz-link.htm 
 
 
Release 2007g - 2007-08-20 10:47:59 -0400 
 
  changes by Paul Eggert 
 
  The "leapseconds" file has been updated to incorporate the most 
  recent International Earth Rotation and Reference Systems Service 
  (IERS) bulletin. 
 
  There's an addition to tz-art.htm regarding the television show "Medium". 
 
 
Release 2007f - 2007-05-07 10:46:46 -0400 
 
  changes by Paul Eggert (including Haiti, Turks and Caicos, and New 
  Zealand) 
 
  changes to zic.c to allow hour values greater than 24 (along with 
  Paul's improved time value overflow checking) 
 
 
Release 2007e - 2007-04-02 10:11:52 -0400 
 
  Syria and Honduras changes by Paul Eggert 
 
  zic.c variable renaming changes by Arthur David Olson 
 
 
Release 2007d - 2007-03-20 08:48:30 -0400 
 
  changes by Paul Eggert 
 
  the elimination of white space at the ends of lines 
 
 
Release 2007c - 2007-02-26 09:09:37 -0500 
 
  changes by Paul Eggert 
 
 
Release 2007b - 2007-02-12 09:34:20 -0500 
 
  Paul Eggert's proposed change to the quotation handling logic in zic.c. 
 
  changes to the commentary in "leapseconds" reflecting the IERS 
  announcement that there is to be no positive leap second at the end 
  of June 2007. 
 
 
Release 2007a - 2007-01-08 12:28:29 -0500 
 
  changes by Paul Eggert 
 
  Derick Rethan's Asmara change 
 
  Oscar van Vlijmen's Easter Island local mean time change 
 
  symbolic link changes 
 
 
Release 2006p - 2006-11-27 08:54:27 -0500 
 
  changes by Paul Eggert 
 
 
Release 2006o - 2006-11-06 09:18:07 -0500 
 
  changes by Paul Eggert 
 
 
Release 2006n - 2006-10-10 11:32:06 -0400 
 
  changes by Paul Eggert 
 
 
Release 2006m - 2006-10-02 15:32:35 -0400 
 
  changes for Uruguay, Palestine, and Egypt by Paul Eggert 
 
  (minimalist) changes to zic.8 to clarify "until" information 
 
 
Release data2006l - 2006-09-18 12:58:11 -0400 
 
  Paul's best-effort work on this coming weekend's Egypt time change 
 
 
Release 2006k - 2006-08-28 12:19:09 -0400 
 
  changes by Paul Eggert 
 
 
Release 2006j - 2006-08-21 09:56:32 -0400 
 
  changes by Paul Eggert 
 
 
Release code2006i - 2006-08-07 12:30:55 -0400 
 
  localtime.c fixes 
 
  Ken Pizzini's conversion script 
 
 
Release code2006h - 2006-07-24 09:19:37 -0400 
 
  adds public domain notices to four files 
 
  includes a fix for transition times being off by a second 
 
  adds a new recording to the "arts" file (information courtesy Colin Bowern) 
 
 
Release 2006g - 2006-05-08 17:18:09 -0400 
 
  northamerica changes by Paul Eggert 
 
 
Release 2006f - 2006-05-01 11:46:00 -0400 
 
  a missing version number problem is fixed (with thanks to Bradley 
  White for catching the problem) 
 
 
Release 2006d - 2006-04-17 14:33:43 -0400 
 
  changes by Paul Eggert 
 
  added new items to tz-arts.htm that were found by Paul 
 
 
Release 2006c - 2006-04-03 10:09:32 -0400 
 
  two sets of data changes by Paul Eggert 
 
  a fencepost error fix in zic.c 
 
  changes to zic.c and the "europe" file to minimize differences 
  between output produced by the old 32-bit zic and the new 64-bit 
  version 
 
 
Release 2006b - 2006-02-20 10:08:18 -0500 
  [tz32code2006b + tz64code2006b + tzdata2006b] 
 
  64-bit code 
 
  All SCCS IDs were bumped to "8.1" for this release. 
 
 
Release 2006a - 2006-01-30 08:59:31 -0500 
 
  changes by Paul Eggert (in particular, Indiana time zone moves) 
 
  an addition to the zic manual page to describe how special-case 
  transitions are handled 
 
 
Release 2005r - 2005-12-27 09:27:13 -0500 
 
  Canadian changes by Paul Eggert 
 
  They also add "<pre>" directives to time zone data files and reflect 
  changes to warning message logic in "zdump.c" (but with calls to 
  "gettext" kept unbundled at the suggestion of Ken Pizzini). 
 
 
Release 2005q - 2005-12-13 09:17:09 -0500 
 
  Nothing earth-shaking here: 
        1.  Electronic mail addresses have been removed. 
        2.  Casts of the return value of exit have been removed. 
        3.  Casts of the argument of is.* macros have been added. 
        4.  Indentation in one section of zic.c has been fixed. 
        5.  References to dead URLs in the data files have been dealt with. 
 
 
Release 2005p - 2005-12-05 10:30:53 -0500 
 
  "systemv", "tz-link.htm", and "zdump.c" changes 
  (less the casts of arguments to the is* macros) 
 
 
Release 2005o - 2005-11-28 10:55:26 -0500 
 
  Georgia, Cuba, Nicaragua, and Jordan changes by Paul Eggert 
 
  zdump.c lint fixes by Arthur David Olson 
 
 
Release 2005n - 2005-10-03 09:44:09 -0400 
 
  changes by Paul Eggert (both the Uruguay changes and the Kyrgyzstan 
  et al. changes) 
 
 
Release 2005m - 2005-08-29 12:15:40 -0400 
 
  changes by Paul Eggert (with a small tweak to the tz-art change) 
 
  a declaration of an unused variable has been removed from zdump.c 
 
 
Release 2005l - 2005-08-22 12:06:39 -0400 
 
  changes by Paul Eggert 
 
  overflow/underflow checks by Arthur David Olson, minus changes to 
  the "Theory" file about the pending addition of 64-bit data (I grow 
  less confident of the changes being accepted with each passing day, 
  and the changes no longer increase the data files nine-fold--there's 
  less than a doubling in size by my local Sun's reckoning) 
 
 
Release 2005k - 2005-07-14 14:14:24 -0400 
 
  The "leapseconds" file has been edited to reflect the recently 
  announced leap second at the end of 2005. 
 
  I've also deleted electronic mail addresses from the files as an 
  anti-spam measure. 
 
 
Release 2005j - 2005-06-13 14:34:13 -0400 
 
  These reflect changes to limit the length of time zone abbreviations 
  and the characters used in those abbreviations. 
 
  There are also changes to handle POSIX-style "quoted" time zone 
  environment variables. 
 
  The changes were circulated on the time zone mailing list; the only 
  change since then was the removal of a couple of minimum-length of 
  abbreviation checks. 
 
 
Release data2005i - 2005-04-21 15:04:16 -0400 
 
  changes (most importantly to Nicaragua and Haiti) by Paul Eggert 
 
 
Release 2005h - 2005-04-04 11:24:47 -0400 
 
  changes by Paul Eggert 
 
  minor changes to Makefile and zdump.c to produce more useful output 
  when doing a "make typecheck" 
 
 
Release 2005g - 2005-03-14 10:11:21 -0500 
 
  changes by Paul Eggert (a change to current DST rules in Uruguay and 
  an update to a link to time zone software) 
 
 
Release 2005f - 2005-03-01 08:45:32 -0500 
 
  data and documentation changes by Paul Eggert 
 
 
Release 2005e - 2005-02-10 15:59:44 -0500 
 
  [not summarized] 
 
 
Release code2005d - 2005-01-31 09:21:47 -0500 
 
  make zic complain about links to links if the -v flag is used 
 
  have "make public" do more code checking 
 
  add an include to "localtime.c" for the benefit of gcc systems 
 
 
Release 2005c - 2005-01-17 18:36:29 -0500 
 
  get better results when mktime runs on a system where time_t is double 
 
  changes to the data files (most importantly to Paraguay) 
 
 
Release 2005b - 2005-01-10 09:19:54 -0500 
 
  Get localtime and gmtime working on systems with exotic time_t types. 
 
  Update the leap second commentary in the "leapseconds" file. 
 
 
Release 2005a - 2005-01-01 13:13:44 -0500 
 
  [not summarized] 
 
 
Release code2004i - 2004-12-14 13:42:58 -0500 
 
  Deal with systems where time_t is unsigned. 
 
 
Release code2004h - 2004-12-07 11:40:18 -0500 
 
  64-bit-time_t changes 
 
 
Release 2004g - 2004-11-02 09:06:01 -0500 
 
  update to Cuba (taking effect this weekend) 
 
  other changes by Paul Eggert 
 
  correction of the spelling of Oslo 
 
  changed versions of difftime.c and private.h 
 
 
Release code2004f - 2004-10-21 10:25:22 -0400 
 
  Cope with wide-ranging tm_year values. 
 
 
Release 2004e - 2004-10-11 14:47:21 -0400 
 
  Brazil/Argentina/Israel changes by Paul Eggert 
 
  changes to tz-link.htm by Paul 
 
  one small fix to Makefile 
 
 
Release 2004d - 2004-09-22 08:27:29 -0400 
 
  Avoid overflow problems when TM_YEAR_BASE is added to an integer. 
 
 
Release 2004c - 2004-08-11 12:06:26 -0400 
 
  asctime-related changes 
 
  (variants of) some of the documentation changes suggested by Paul Eggert 
 
 
Release 2004b - 2004-07-19 14:33:35 -0400 
 
  data changes by Paul Eggert - most importantly, updates for Argentina 
 
 
Release 2004a - 2004-05-27 12:00:47 -0400 
 
  changes by Paul Eggert 
 
  Handle DST transitions that occur at the end of a month in some 
  years but at the start of the following month in other years. 
 
  Add a copy of the correspondence that's the basis for claims about 
  DST in the Navajo Nation. 
 
 
Release 2003e - 2003-12-15 09:36:47 -0500 
 
  changes by Arthur David Olson (primarily code changes) 
 
  changes by Paul Eggert (primarily data changes) 
 
  minor changes to "Makefile" and "northamerica" (in the latter case, 
  optimization of the "Toronto" rules) 
 
 
Release 2003d - 2003-10-06 09:34:44 -0400 
 
  changes by Paul Eggert 
 
 
Release 2003c - 2003-09-16 10:47:05 -0400 
 
  Fix bad returns in zic.c's inleap function. 
  Thanks to Bradley White for catching the problem! 
 
 
Release 2003b - 2003-09-16 07:13:44 -0400 
 
  Add a "--version" option (and documentation) to the zic and zdump commands. 
 
  changes to overflow/underflow checking in zic 
 
  a localtime typo fix. 
 
  Update the leapseconds and tz-art.htm files. 
 
 
Release 2003a - 2003-03-24 09:30:54 -0500 
 
  changes by Paul Eggert 
 
  a few additions and modifications to the tz-art.htm file 
 
 
Release 2002d - 2002-10-15 13:12:42 -0400 
 
  changes by Paul Eggert, less the "Britain (UK)" change in iso3166.tab 
 
  There's also a new time zone quote in "tz-art.htm". 
 
 
Release 2002c - 2002-04-04 11:55:20 -0500 
 
  changes by Paul Eggert 
 
  Change zic.c to avoid creating symlinks to files that don't exist. 
 
 
Release 2002b - 2002-01-28 12:56:03 -0500 
 
  [These change notes are for Release 2002a, which was corrupted. 
  2002b was a corrected version of 2002a.] 
 
  changes by Paul Eggert 
 
  Update the "leapseconds" file to note that there'll be no leap 
  second at the end of June, 2002. 
 
  Change "zic.c" to deal with a problem in handling the "Asia/Bishkek" zone. 
 
  Change to "difftime.c" to avoid sizeof problems. 
 
 
Release 2001d - 2001-10-09 13:31:32 -0400 
 
  changes by Paul Eggert 
 
 
Release 2001c - 2001-06-05 13:59:55 -0400 
 
  changes by Paul Eggert and Andrew Brown 
 
 
Release 2001b - 2001-04-05 16:44:38 -0400 
 
  changes by Paul Eggert (modulo jnorgard's typo fix) 
 
  tz-art.htm has been HTMLified. 
 
 
Release 2001a - 2001-03-13 12:57:44 -0500 
 
  changes by Paul Eggert 
 
  An addition to the "leapseconds" file: comments with the text of the 
  latest IERS leap second notice. 
 
  Trailing white space has been removed from data file lines, and 
  repeated spaces in "Rule Jordan" lines in the "asia" file have been 
  converted to tabs. 
 
 
Release 2000h - 2000-12-14 15:33:38 -0500 
 
  changes by Paul Eggert 
 
  one typo fix in the "art" file 
 
  With providence, this is the last update of the millennium. 
 
 
Release 2000g - 2000-10-10 11:35:22 -0400 
 
  changes by Paul Eggert 
 
  correction of John Mackin's name submitted by Robert Elz 
 
  Garry Shandling's Daylight Saving Time joke (!?!) from the recent 
  Emmy Awards broadcast. 
 
 
Release 2000f - 2000-08-10 09:31:58 -0400 
 
  changes by Paul Eggert 
 
  Added information in "tz-art.htm" on a Seinfeld reference to DST. 
 
  Error checking and messages in the "yearistype" script have been 
  improved. 
 
 
Release 2000e - 2000-07-31 09:27:54 -0400 
 
  data changes by Paul Eggert 
 
  a change to the default value of the defined constant HAVE_STRERROR 
 
  the addition of a Dave Barry quote on DST to the tz-arts file 
 
 
Release 2000d - 2000-04-20 15:43:04 -0400 
 
  changes to the documentation and code of strftime for C99 conformance 
 
  a bug fix for date.c 
 
  These are based on (though modified from) changes by Paul Eggert. 
 
 
Release 2000c - 2000-03-04 10:31:43 -0500 
 
  changes by Paul Eggert 
 
 
Release 2000b - 2000-02-21 12:16:29 -0500 
 
  changes by Paul Eggert and Joseph Myers 
 
  modest tweaks to the tz-art.htm and tz-link.htm files 
 
 
Release 2000a - 2000-01-18 09:21:26 -0500 
 
  changes by Paul Eggert 
 
  The two hypertext documents have also been renamed. 
 
 
Release code1999i-data1999j - 1999-11-15 18:43:22 -0500 
 
  Paul Eggert's changes 
 
  additions to the "zic" manual page and the "Arts.htm" file 
 
 
Release code1999h-data1999i - 1999-11-08 14:55:21 -0500 
 
  [not summarized] 
 
 
Release data1999h - 1999-10-07 03:50:29 -0400 
 
  changes by Paul Eggert to "europe" (most importantly, fixing 
  Lithuania and Estonia) 
 
 
Release 1999g - 1999-09-28 11:06:18 -0400 
 
  data changes by Paul Eggert (most importantly, the change for 
  Lebanon that buys correctness for this coming Sunday) 
 
  The "code" file contains changes to "Makefile" and "checktab.awk" to 
  allow better checking of time zone files before they are published. 
 
 
Release 1999f - 1999-09-23 09:48:14 -0400 
 
  changes by Arthur David Olson and Paul Eggert 
 
 
Release 1999e - 1999-08-17 15:20:54 -0400 
 
  changes circulated by Paul Eggert, although the change to handling 
  of DST-specifying time zone names has been commented out for now 
  (search for "XXX" in "localtime.c" for details).  These files also 
  do not make any changes to the start of DST in Brazil. 
 
  In addition to Paul's changes, there are updates to "Arts.htm" and 
  cleanups of URLs. 
 
 
Release 1999d - 1999-03-30 11:31:07 -0500 
 
  changes by Paul Eggert 
 
  The Makefile's "make public" rule has also been changed to do a test 
  compile of each individual time zone data file (which should help 
  avoid problems such as the one we had with Nicosia). 
 
 
Release 1999c - 1999-03-25 09:47:47 -0500 
 
  changes by Paul Eggert, most importantly the change for Chile. 
 
 
Release 1999b - 1999-02-01 17:51:44 -0500 
 
  changes by Paul Eggert 
 
  code changes (suggested by Mani Varadarajan, mani at be.com) for 
  correct handling of symbolic links when building using a relative directory 
 
  code changes to generate correct messages for failed links 
 
  updates to the URLs in Arts.htm 
 
 
Release 1999a - 1999-01-19 16:20:29 -0500 
 
  error message internationalizations and corrections in zic.c and 
  zdump.c (as suggested by Vladimir Michl, vladimir.michl at upol.cz, 
  to whom thanks!) 
 
 
Release code1998h-data1998i - 1998-10-01 09:56:10 -0400 
 
  changes for Brazil, Chile, and Germany 
 
  support for use of "24:00" in the input files for the time zone compiler 
 
 
Release code1998g-data1998h - 1998-09-24 10:50:28 -0400 
 
  changes by Paul Eggert 
 
  correction to a define in the "private.h" file 
 
 
Release data1998g - 1998-08-11 03:28:35 -0000 
  [tzdata1998g.tar.gz is missing!] 
 
  Lithuanian change provided by mgedmin at pub.osf.it 
 
  Move creation of the GMT link with Etc/GMT to "etcetera" (from 
  "backward") to ensure that the GMT file is created even where folks 
  don't want the "backward" links (as suggested by Paul Eggert). 
 
 
Release data1998f - 1998-07-20 13:50:00 -0000 
  [tzdata1998f.tar.gz is missing!] 
 
  Update the "leapseconds" file to include the newly-announced 
  insertion at the end of 1998. 
 
 
Release code1998f - 1998-06-01 10:18:31 -0400 
 
  addition to localtime.c by Guy Harris 
 
 
Release 1998e - 1998-05-28 09:56:26 -0400 
 
  The Makefile is changed to produce zoneinfo-posix rather than 
  zoneinfo/posix, and to produce zoneinfo-leaps rather than 
  zoneinfo/right. 
 
  data changes by Paul Eggert 
 
  changes from Guy Harris to provide asctime_r and ctime_r 
 
  A usno1998 file (substantially identical to usno1997) has been added. 
 
 
Release 1998d - 1998-05-14 11:58:34 -0400 
 
  changes to comments (in particular, elimination of references to CIA maps). 
  "Arts.htm", "WWW.htm", "asia", and "australasia" are the only places 
  where changes occur. 
 
 
Release 1998c - 1998-02-28 12:32:26 -0500 
 
  changes by Paul Eggert (save the "French correction," on which I'll 
  wait for the dust to settle) 
 
  symlink changes 
 
  changes and additions to Arts.htm 
 
 
Release 1998b - 1998-01-17 14:31:51 -0500 
 
  URL cleanups and additions 
 
 
Release 1998a - 1998-01-13 12:37:35 -0500 
 
  changes by Paul Eggert 
 
 
Release code1997i-data1997k - 1997-12-29 09:53:41 -0500 
 
  changes by Paul Eggert, with minor modifications from Arthur David 
  Olson to make the files more browser friendly 
 
 
Release code1997h-data1997j - 1997-12-18 17:47:35 -0500 
 
  minor changes to put "TZif" at the start of each time zone information file 
 
  a rule has also been added to the Makefile so you can 
        make zones 
  to just recompile the zone information files (rather than doing a 
  full "make install" with its other effects). 
 
 
Release data1997i - 1997-10-07 08:45:38 -0400 
 
  changes to Africa by Paul Eggert 
 
 
Release code1997g-data1997h - 1997-09-04 16:56:54 -0400 
 
  corrections for Uruguay (and other locations) 
 
  Arthur David Olson's simple-minded fix allowing mktime to both 
  correctly handle leap seconds and correctly handle tm_sec values 
  upon which arithmetic has been performed. 
 
 
Release code1997f-data1997g - 1997-07-19 13:15:02 -0400 
 
  Paul Eggert's updates 
 
  a small change to a function prototype; 
 
  "Music" has been renamed "Arts.htm", HTMLified, and augmented to 
  include information on Around the World in Eighty Days. 
 
 
Release code1997e-data1997f - 1997-05-03 18:52:34 -0400 
 
  fixes to zic's error handling 
 
  changes inspired by the item circulated on Slovenia 
 
  The description of Web resources has been HTMLified for browsing 
  convenience. 
 
  A new piece of tz-related music has been added to the "Music" file. 
 
 
Release code1997d-data1997e - 1997-03-29 12:48:52 -0500 
 
  Paul Eggert's latest suggestions 
 
 
Release code1997c-data1997d - 1997-03-07 20:37:54 -0500 
 
  changes to "zic.c" to correct performance of the "-s" option 
 
  a new file "usno1997" 
 
 
Release data1997c - 1997-03-04 09:58:18 -0500 
 
  changes in Israel 
 
 
Release 1997b - 1997-02-27 18:34:19 -0500 
 
  The data file incorporates the 1997 leap second. 
 
  The code file incorporates Arthur David Olson's take on the 
  zic/multiprocessor/directory-creation situation. 
 
 
Release 1997a - 1997-01-21 09:11:10 -0500 
 
  Paul Eggert's Antarctica (and other changes) 
 
  Arthur David Olson finessed the "getopt" issue by checking against 
  both -1 and EOF (regardless of POSIX, SunOS 4.1.1's manual says -1 
  is returned while SunOS 5.5's manual says EOF is returned). 
 
 
Release code1996o-data1996n - 1996-12-27 21:42:05 -0500 
 
  Paul Eggert's latest changes 
 
 
Release code1996n - 1996-12-16 09:42:02 -0500 
 
  link snapping fix from Bruce Evans (via Garrett Wollman) 
 
 
Release data1996m - 1996-11-24 02:37:34 -0000 
  [tzdata1996m.tar.gz is missing!] 
 
  Paul Eggert's batch of changes 
 
 
Release code1996m-data1996l - 1996-11-05 14:00:12 -0500 
 
  No functional changes here; the files have simply been changed to 
  make more use of ISO style dates in comments. The names of the above 
  files now include the year in full. 
 
 
Release code96l - 1996-09-08 17:12:20 -0400 
 
  tzcode96k was missing a couple of pieces. 
 
 
Release 96k - 1996-09-08 16:06:22 -0400 
 
  the latest round of changes from Paul Eggert 
 
  the recent Year 2000 material 
 
 
Release code96j - 1996-07-30 13:18:53 -0400 
 
  Set sp->typecnt as suggested by Timothy Patrick Murphy. 
 
 
Release code96i - 1996-07-27 20:11:35 -0400 
 
  Paul's suggested patch for strftime %V week numbers 
 
 
Release data96i - 1996-07-01 18:13:04 -0400 
 
  "northamerica" and "europe" changes by Paul Eggert 
 
 
Release code96h - 1996-06-05 08:02:21 -0400 
 
  fix for handling transitions specified in Universal Time 
 
  Some "public domain" notices have also been added. 
 
 
Release code96g - 1996-05-16 14:00:26 -0400 
 
  fix for the simultaneous-DST-and-zone-change challenge 
 
 
Release data96h - 1996-05-09 17:40:51 -0400 
 
  changes by Paul Eggert 
 
 
Release code96f-data96g - 1996-05-03 03:09:59 -0000 
  [tzcode96f.tar.gz + tzdata96g.tar.gz are both missing!] 
 
  The changes get us some of the way to fixing the problems noted in Paul 
  Eggert's letter yesterday (in addition to a few others).  The approach 
  has been to make zic a bit smarter about figuring out what time zone 
  abbreviations apply just after the time specified in the "UNTIL" part 
  of a zone line.  Putting the smarts in zic means avoiding having 
  transition times show up in both "Zone" lines and "Rule" lines, which 
  in turn avoids multiple transition time entries in time zone files. 
  (This also makes the zic input files such as "europe" a bit shorter and 
  should ease maintenance.) 
 
 
Release data96f - 1996-04-19 19:20:03 -0000 
  [tzdata96f.tar.gz is missing!] 
 
  The only changes are to the "northamerica" file; the time zone 
  abbreviation for Denver is corrected to MST (and MDT), and the 
  comments for Mexico have been updated. 
 
 
Release data96e - 1996-03-19 17:37:26 -0500 
 
  Proposals by Paul Eggert, in particular the Portugal change that 
  comes into play at the end of this month. 
 
 
Release data96d - 1996-03-18 20:49:39 -0500 
 
  [not summarized] 
 
 
Release code96e - 1996-02-29 15:43:27 -0000 
  [tzcode96e.tar.gz is missing!] 
 
  internationalization changes and the fix to the documentation for strftime 
 
 
Release code96d-data96c - 1996-02-12 11:05:27 -0500 
 
  The "code" file simply updates Bob Kridle's electronic address. 
 
  The "data" file updates rules for Mexico. 
 
 
Release data96b - 1996-01-27 15:44:42 -0500 
 
  Kiribati change 
 
 
Release code96c - 1996-01-16 16:58:15 -0500 
 
  leap-year streamlining and binary-search changes 
 
  fix to newctime.3 
 
 
Release code96b - 1996-01-10 20:42:39 -0500 
 
  fixes and enhancements from Paul Eggert, including code that 
  emulates the behavior of recent versions of the SunOS "date" 
  command. 
 
 
Release 96a - 1996-01-06 09:08:24 -0500 
 
  Israel updates 
 
  fixes to strftime.c for correct ISO 8601 week number generation, 
  plus support for two new formats ('G' and 'g') to give ISO 8601 year 
  numbers (which are not necessarily the same as calendar year numbers) 
 
 
Release code95i-data95m - 1995-12-21 12:46:47 -0500 
 
  The latest revisions from Paul Eggert are included, the usno1995 
  file has been updated, and a new file ("WWW") covering useful URLs 
  has been added. 
 
 
Release code95h-data95l - 1995-12-19 18:10:12 -0500 
 
  A simplification of a macro definition, a change to data for Sudan, 
  and (for last minute shoppers) notes in the "Music" file on the CD 
  "Old Man Time". 
 
 
Release code95g-data95k - 1995-10-30 10:32:47 -0500 
 
  (slightly reformatted) 8-bit-clean proposed patch 
 
  minor patch: US/Eastern -> America/New_York 
 
  snapshot of the USNO's latest data ("usno1995") 
 
  some other minor cleanups 
 
 
Release code95f-data95j - 1995-10-28 21:01:34 -0000 
  [tzcode95f.tar.gz + tzdata95j.tar.gz are both missing!] 
 
  European cleanups 
 
  support for 64-bit time_t's 
 
  optimization in localtime.c 
 
 
Release code95e - 1995-10-13 13:23:57 -0400 
 
  the mktime change to scan from future to past when trying to find time zone 
  offsets 
 
 
Release data95i - 1995-09-26 10:43:26 -0400 
 
  For Canada/Central, guess that the Sun customer's "one week too 
  early" was just a approximation, and the true error is one month 
  too early.  This is consistent with the rest of Canada. 
 
 
Release data95h - 1995-09-21 11:26:48 -0400 
 
  latest changes from Paul Eggert 
 
 
Release code95d - 1995-09-14 11:14:45 -0400 
 
  the addition of a "Music" file, which documents four recorded 
  versions of the tune "Save That Time". 
 
 
Release data95g - 1995-09-01 17:21:36 -0400 
 
  "yearistype" correction 
 
 
Release data95f - 1995-08-28 20:46:56 -0400 
 
  Paul Eggert's change to the australasia file 
 
 
Release data95e - 1995-07-08 18:02:34 -0400 
 
  The only change is a leap second at the end of this year. 
  Thanks to Bradley White for forwarding news on the leap second. 
 
 
Release data95d - 1995-07-03 13:26:22 -0400 
 
  Paul Eggert's changes 
 
 
Release data95c - 1995-07-02 19:19:28 -0400 
 
  changes to "asia", "backward", "europe", and "southamerica" 
  (read: northamericacentrics need not apply) 
 
 
Release code95c - 1995-03-13 14:00:46 -0500 
 
  one-line fix for sign extension problems in detzcode 
 
 
Release 95b - 1995-03-04 11:22:38 -0500 
 
  Minor changes in both: 
 
  The "code" file contains a workaround for the lack of "unistd.h" in 
  Microsoft C++ version 7. 
 
  The "data" file contains a fixed "Link" for America/Shiprock. 
 
 
Release 94h - 1994-12-10 12:51:14 -0500 
 
  The files: 
 
  *     incorporate the changes to "zdump" and "date" to make changes to 
        the "TZ" environment variable permanent; 
 
  *     incorporate the table changes by Paul Eggert; 
 
  *     include (and document) support for universal time specifications in 
        data files - but do not (yet) include use of this feature in the 
        data files. 
 
  Think of this as "TZ Classic" - the software has been set up not to break if 
  universal time shows up in its input, and data entries have been 
  left as is so as not to break existing implementations. 
 
 
Release data94f - 1994-08-20 12:56:09 -0400 
 
  (with thanks!) the latest data updates from Paul Eggert 
 
 
Release data94e - 1994-06-04 13:13:53 -0400 
 
  [not summarized] 
 
 
Release code94g - 1994-05-05 12:14:07 -0400 
 
  fix missing "optind.c" and a reference to it in the Makefile 
 
 
Release code94f - 1994-05-05 13:00:33 -0000 
  [tzcode94f.tar.gz is missing!] 
 
  changes to avoid overflow in difftime, as well as changes to cope 
  with the 52/53 challenge in strftime 
 
 
Release code94e - 1994-03-30 23:32:59 -0500 
 
  change for the benefit of PCTS 
 
 
Release 94d - 1994-02-24 15:42:25 -0500 
 
  Avoid clashes with POSIX semantics for zones such as GMT+4. 
 
  Some other very minor housekeeping is also present. 
 
 
Release code94c - 1994-02-10 08:52:40 -0500 
 
  Fix bug where mkdirs was broken unless you compile with 
  -fwritable-strings (which is generally losing to do). 
 
 
Release 94b - 1994-02-07 10:04:33 -0500 
 
  work by Paul Eggert who notes: 
 
  I found another book of time zone histories by E W Whitman; it's not 
  as extensive as Shanks but has a few goodies of its own.  I used it 
  to update the tables.  I also fixed some more as a result of 
  correspondence with Adam David and Peter Ilieve, and move some stray 
  links from 'europe' to 'backward'.  I corrected some scanning errors 
  in usno1989. 
 
  As far as the code goes, I fixed zic to allow years in the range 
  INT_MIN to INT_MAX; this fixed a few boundary conditions around 1900. 
  And I cleaned up the zic documentation a little bit. 
 
 
Release data94a - 1994-02-03 08:58:54 -0500 
 
  It simply incorporates the recently announced leap second into the 
  "leapseconds" file. 
 
 
Release 93g - 1993-11-22 17:28:27 -0500 
 
  Paul Eggert has provided a good deal of historic information (based 
  on Shanks), and there are some code changes to deal with the buglets 
  that crawled out in dealing with the new information. 
 
 
Release 93f - 1993-10-15 12:27:46 -0400 
 
  Paul Eggert's changes 
 
 
Release 93e - 1993-09-05 21:21:44 -0400 
 
  This has updated data for Israel, England, and Kwajalein.  There's 
  also an update to "zdump" to cope with Kwajalein's 24-hour jump. 
  Thanks to Paul Eggert and Peter Ilieve for the changes. 
 
 
Release 93d - 1993-06-17 23:34:17 -0400 
 
  new fix and new data on Israel 
 
 
Release 93c - 1993-06-06 19:31:55 -0400 
 
  [not summarized] 
 
 
Release 93b - 1993-02-02 14:53:58 -0500 
 
  updated "leapseconds" file 
 
 
Release 93 - 1993-01-08 07:01:06 -0500 
 
  At kre's suggestion, the package has been split in two - a code piece 
  (which also includes documentation) that's only of use to folks who 
  want to recompile things and a data piece useful to anyone who can 
  run "zic". 
 
  The new version has a few changes to the data files, a few 
  portability changes, and an off-by-one fix (with thanks to 
  Tom Karzes at deshaw.com for providing a description and a 
  solution). 
 
 
Release 92c - 1992-11-21 17:35:36 -0000 
  [tz92c.tar.Z is missing!] 
 
  The fallout from the latest round of DST transitions. 
 
  There are changes for Portugal, Saskatchewan, and "Pacific-New"; 
  there's also a change to "zic.c" that makes it portable to more systems. 
 
 
Release 92 - 1992-04-25 18:17:03 -0000 
  [tz92.tar.Z is missing!] 
 
  By popular demand (well, at any rate, following a request by kre at munnari) 
 
 
The 1989 update of the time zone package featured: 
 
  *     POSIXization (including interpretation of POSIX-style TZ environment 
        variables, provided by Guy Harris), 
  *     ANSIfication (including versions of "mktime" and "difftime"), 
  *     SVIDulation (an "altzone" variable) 
  *     MACHination (the "gtime" function) 
  *     corrections to some time zone data (including corrections to the rules 
        for Great Britain and New Zealand) 
  *     reference data from the United States Naval Observatory for folks who 
        want to do additional time zones 
  *     and the 1989 data for Saudi Arabia. 
 
  (Since this code will be treated as "part of the implementation" in some 
  places and as "part of the application" in others, there's no good way to 
  name functions, such as timegm, that are not part of the proposed ANSI C 
  standard; such functions have kept their old, underscore-free names in this 
  update.) 
 
  And the "dysize" function has disappeared; it was present to allow 
  compilation of the "date" command on old BSD systems, and a version of "date" 
  is now provided in the package.  The "date" command is not created when you 
  "make all" since it may lack options provided by the version distributed with 
  your operating system, or may not interact with the system in the same way 
  the native version does. 
 
  Since POSIX frowns on correct leap second handling, the default behavior of 
  the "zic" command (in the absence of a "-L" option) has been changed to omit 
  leap second information from its output files. 
 
 
----- 
Notes 
 
This file contains copies of the part of each release announcement 
that talks about the changes in that release.  The text has been 
adapted and reformatted for the purposes of this file. 
 
Traditionally a release R consists of a pair of tarball files, 
tzcodeR.tar.gz and tzdataR.tar.gz.  However, some releases (e.g., 
code2010a, data2012c) consist of just one or the other tarball, and a 
few (e.g., code2012c-data2012d) have tarballs with mixed version 
numbers.  Recent releases also come in an experimental format 
consisting of a single tarball tzdb-R.tar.lz with extra data. 
 
Release timestamps are taken from the release's commit (for newer, 
Git-based releases), from the newest file in the tarball (for older 
releases, where this info is available) or from the email announcing 
the release (if all else fails; these are marked with a time zone of 
-0000 and an "is missing!" comment). 
 
Earlier versions of the code and data were not announced on the tz 
list and are not summarized here. 
 
This file is in the public domain. 
 
Local Variables: 
coding: utf-8 
End: