Branch: Tag:

2018-12-18

2018-12-18 10:39:08 by Henrik Grubbström (Grubba) <grubba@grubba.org>

Updated to tzdata2018g.

1:   News for the tz database    + Release 2018g - 2018-10-26 22:22:45 -0700 +  +  Briefly: +  Morocco switches to permanent +01 on 2018-10-27. +  +  Changes to future timestamps +  +  Morocco switches from +00/+01 to permanent +01 effective 2018-10-27, +  so its clocks will not fall back on 2018-10-28 as previously scheduled. +  (Thanks to Mohamed Essedik Najd and Brian Inglis.) +  +  Changes to code +  +  When generating TZif files with leap seconds, zic no longer uses a +  format that trips up older 32-bit clients, fixing a bug introduced +  in 2018f. (Reported by Daniel Fischer.) Also, the zic workaround +  for QTBUG-53071 now also works for TZif files with leap seconds. +  +  The translator to rearguard format now rewrites the line +  "Rule Japan 1948 1951 - Sep Sat>=8 25:00 0 S" to +  "Rule Japan 1948 1951 - Sep Sun>=9 1:00 0 S". +  This caters to zic before 2007 and to Oracle TZUpdater 2.2.0 +  and earlier. (Reported by Christos Zoulas.) +  +  Changes to past time zone abbreviations +  +  Change HDT to HWT/HPT for WWII-era abbreviations in Hawaii. +  This reverts to 2011h, as the abbreviation change in 2011i was +  likely inadvertent. +  +  Changes to documentation +  +  tzfile.5 has new sections on interoperability issues. +  +  + Release 2018f - 2018-10-18 00:14:18 -0700 +  +  Briefly: +  Volgograd moves from +03 to +04 on 2018-10-28. +  Fiji ends DST 2019-01-13, not 2019-01-20. +  Most of Chile changes DST dates, effective 2019-04-06. +  +  Changes to future timestamps +  +  Volgograd moves from +03 to +04 on 2018-10-28 at 02:00. +  (Thanks to Alexander Fetisov and Stepan Golosunov.) +  +  Fiji ends DST 2019-01-13 instead of the 2019-01-20 previously +  predicted. (Thanks to Raymond Kumar.) Adjust future predictions +  accordingly. +  +  Most of Chile will end DST on the first Saturday in April at 24:00 mainland +  time, and resume DST on the first Saturday in September at 24:00 mainland +  time. The changes are effective from 2019-04-06, and do not affect the +  Magallanes region modeled by America/Punta_Arenas. (Thanks to Juan Correa +  and Tim Parenti.) Adjust future predictions accordingly. +  +  Changes to past timestamps +  +  The 2018-05-05 North Korea 30-minute time zone change took place +  at 23:30 the previous day, not at 00:00 that day. +  +  China's 1988 spring-forward transition was on April 17, not +  April 10. Its DST transitions in 1986/91 were at 02:00, not 00:00. +  (Thanks to P Chan.) +  +  Fix several issues for Macau before 1992. Macau's pre-1904 LMT +  was off by 10 s. Macau switched to +08 in 1904 not 1912, and +  temporarily switched to +09/+10 during World War II. Macau +  observed DST in 1942/79, not 1961/80, and there were several +  errors for transition times and dates. (Thanks to P Chan.) +  +  The 1948-1951 fallback transitions in Japan were at 25:00 on +  September's second Saturday, not at 24:00. (Thanks to Phake Nick.) +  zic turns this into 01:00 on the day after September's second +  Saturday, which is the best that POSIX or C platforms can do. +  +  Incorporate 1940-1949 Asia/Shanghai DST transitions from a 2014 +  paper by Li Yu, replacing more-questionable data from Shanks. +  +  Changes to time zone abbreviations +  +  Use "PST" and "PDT" for Philippine time. (Thanks to Paul Goyette.) +  +  Changes to code +  +  zic now always generates TZif files where time type 0 is used for +  timestamps before the first transition. This simplifies the +  reading of TZif files and should not affect behavior of existing +  TZif readers because the same set of time types is used; only +  their internal indexes may have changed. This affects only the +  legacy zones EST5EDT, CST6CDT, MST7MDT, PST8PDT, CET, MET, and +  EET, which previously used nonzero types for these timestamps. +  +  Because of the type 0 change, zic no longer outputs a dummy +  transition at time -2**59 (before the Big Bang), as clients should +  no longer need this to handle historical timestamps correctly. +  This reverts a change introduced in 2013d and shrinks most TZif +  files by a few bytes. +  +  zic now supports negative time-of-day in Rule and Leap lines, e.g., +  "Rule X min max - Apr lastSun -6:00 1:00 -" means the transition +  occurs at 18:00 on the Saturday before the last Sunday in April. +  This behavior was documented in 2018a but the code did not +  entirely match the documentation. +  +  localtime.c no longer requires at least one time type in TZif +  files that lack transitions or have a POSIX-style TZ string. This +  future-proofs the code against possible future extensions to the +  format that would allow TZif files with POSIX-style TZ strings and +  without transitions or time types. +  +  A read-access subscript error in localtime.c has been fixed. +  It could occur only in TZif files with timecnt == 0, something that +  does not happen in practice now but could happen in future versions. +  +  localtime.c no longer ignores TZif POSIX-style TZ strings that +  specify only standard time. Instead, these TZ strings now +  override the default time type for timestamps after the last +  transition (or for all time stamps if there are no transitions), +  just as DST strings specifying DST have always done. +  +  leapseconds.awk now outputs "#updated" and "#expires" comments, +  and supports leap seconds at the ends of months other than June +  and December. (Inspired by suggestions from Chris Woodbury.) +  +  Changes to documentation +  +  New restrictions: A Rule name must start with a character that +  is neither an ASCII digit nor "-" nor "+", and an unquoted name +  should not use characters in the set "!$%&'()*,/:;<=>?@[\]^`{|}~". +  The latter restriction makes room for future extensions (a +  possibility noted by Tom Lane). +  +  tzfile.5 now documents what time types apply before the first and +  after the last transition, if any. +  +  Documentation now uses the spelling "timezone" for a TZ setting +  that determines timestamp history, and "time zone" for a +  geographic region currently sharing the same standard time. +  +  The name "TZif" is now used for the tz binary data format. +  +  tz-link.htm now mentions the A0 TimeZone Migration utilities. +  (Thanks to Aldrin Martoq for the link.) +  +  Changes to build procedure +  +  New 'make' target 'rearguard_tarballs' to build the rearguard +  tarball only. This is a convenience on platforms that lack lzip +  if you want to build the rearguard tarball. (Problem reported by +  Deborah Goldsmith.) +  +  tzdata.zi is now more stable from release to release. (Problem +  noted by Tom Lane.) It is also a bit shorter. +  +  tzdata.zi now can contain comment lines documenting configuration +  information, such as which data format was selected, which input +  files were used, and how leap seconds are treated. (Problems +  noted by Lester Caine and Brian Inglis.) If the Makefile defaults +  are used these comment lines are absent, for backward +  compatibility. A redistributor intending to alter its copy of the +  files should also append "-LABEL" to the 'version' file's first +  line, where "LABEL" identifies the redistributor's change. +  +    Release 2018e - 2018-05-01 23:42:51 -0700       Briefly:
9:    '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 +  Changes to past and future timestamps       North Korea switches back from +0830 to +09 on 2018-05-05.    (Thanks to Kang Seonghoon, Arthur David Olson, Seo Sanghyeon,
17:       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 +  Also, this now affects historical timestamps 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), +  negative DST to model timestamps 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
44:    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 +  Changes to past timestamps       From 1994 through 2017 Namibia observed DST in winter, not summer.    That is, it used negative DST, as Ireland still does. This change
54:    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 +  and main format; in rearguard 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 +  The full effect of this change is only in vanguard and main +  formats; in rearguard format, it is modeled as plain GMT without    daylight saving. Also, the dates of some 1944/5 DST transitions    in Czechoslovakia have been changed.   
72:    Add support for vanguard and rearguard data consumers.    Add subsecond precision to source data format, though not to data.    -  Changes to future time stamps +  Changes to future timestamps       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 +  Changes to past and future timestamps       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 +  Changes to past timestamps       Historical transitions for Uruguay, represented by    America/Montevideo, have been updated per official legal documents,
224:    change is reapplied. (Problems reported by Deborah Goldsmith and    Stephen Colebourne.)    -  Changes to past time stamps +  Changes to past timestamps       Japanese DST transitions (1948-1951) were Sundays at 00:00, not    Saturdays or Sundays at 02:00. (Thanks to Takayuki Nikai.)
256:    Use Debian-style installation locations, instead of 4.3BSD-style.    New zic option -t.    -  Changes to past and future time stamps +  Changes to past and future timestamps       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 +  Changes to future timestamps       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 +  Changes to past timestamps       A discrepancy of 4 s in timestamps before 1931 in South Sudan has    been corrected. The 'backzone' and 'zone.tab' files did not agree
355:    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 +  Changes to future timestamps       Northern Cyprus has decided to resume EU rules starting    2017-10-29, thus reinstituting winter time.
381:    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 +  Changes to past timestamps       Namibia switched from +02 to +01 on 1994-03-21, not 1994-04-03.    (Thanks to Arthur David Olson.)
511:       Briefly: Haiti has resumed DST.    -  Changes to past and future time stamps +  Changes to past and future timestamps       Haiti resumed observance of DST in 2017. (Thanks to Steffen Thorsen.)    -  Changes to past time stamps +  Changes to past timestamps       Liberia changed from -004430 to +00 on 1972-01-07, not 1972-05-01.   
527:    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 +  environment variable has a value 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.)
538:    Briefly: Southern Chile moves from -04/-03 to -03, and Mongolia    discontinues DST.    -  Changes to future time stamps +  Changes to future timestamps       Mongolia no longer observes DST. (Thanks to Ganbold Tsagaankhuu.)   
549:    assume it's permanent. (Thanks to Juan Correa and Deborah    Goldsmith.) This also affects Antarctica/Palmer.    -  Changes to past time stamps +  Changes to past timestamps    -  Fix many entries for historical time stamps for Europe/Madrid +  Fix many entries for historical timestamps 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 +  this changes some timestamps 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.)
645:       Briefly: Saratov, Russia moves from +03 to +04 on 2016-12-04.    -  Changes to future time stamps +  Changes to future timestamps       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 +  Changes to past timestamps       The new zone Asia/Atyrau for Atyraū Region, Kazakhstan, is like    Asia/Aqtau except it switched from +05/+06 to +04/+05 in spring
687:    Briefly: Cyprus split into two time zones on 2016-10-30, and Tonga    reintroduces DST on 2016-11-06.    -  Changes to future time stamps +  Changes to future timestamps       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
695:    January, like Fiji. (Thanks to Pulu ʻAnau.) Switch to numeric    time zone abbreviations for this zone.    -  Changes to past and future time stamps +  Changes to past and future timestamps       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
704:    Antarctica/Casey switched from +08 to +11 on 2016-10-22.    (Thanks to Steffen Thorsen.)    -  Changes to past time stamps +  Changes to past timestamps    -  Several corrections were made for pre-1975 time stamps in Italy. +  Several corrections were made for pre-1975 timestamps in Italy.    These affect Europe/Malta, Europe/Rome, Europe/San_Marino, and    Europe/Vatican.   
744:      Release 2016h - 2016-10-19 23:17:57 -0700    -  Changes to future time stamps +  Changes to future timestamps       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
752:    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 +  Changes to past timestamps       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
801:      Release 2016g - 2016-09-13 08:56:38 -0700    -  Changes to future time stamps +  Changes to future timestamps       Turkey switched from EET/EEST (+02/+03) to permanent +03,    effective 2016-09-07. (Thanks to Burak AYDIN.) Use "+03" rather
810:    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 +  Changes to past timestamps       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
859:    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.) +  Africa/Casablanca and Africa/El_Aaiun in some year-2037 timestamps +  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
924:      Release 2016f - 2016-07-05 16:26:51 +0200    -  Changes affecting future time stamps +  Changes affecting future timestamps       The Egyptian government changed its mind on short notice, and    Africa/Cairo will not introduce DST starting 2016-07-07 after all.
933:    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 +  Changes to past and future timestamps       Asia/Novokuznetsk and Asia/Novosibirsk now use numeric time zone    abbreviations instead of invented ones.    -  Changes affecting past time stamps +  Changes affecting past timestamps       Europe/Minsk's 1992-03-29 spring-forward transition was at 02:00 not 00:00.    (Thanks to Stepan Golosunov.)
946:      Release 2016e - 2016-06-14 08:46:16 -0700    -  Changes affecting future time stamps +  Changes affecting future timestamps       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 +  Changes affecting past timestamps       Locations while uninhabited now use '-00', not 'zzz', as a    placeholder time zone abbreviation. This is inspired by Internet
982:      Release 2016d - 2016-04-17 22:50:29 -0700    -  Changes affecting future time stamps +  Changes affecting future timestamps       America/Caracas switches from -0430 to -04 on 2016-05-01 at 02:30.    (Thanks to Alexander Krivenyshev for the heads-up.)
994:    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 +  Changes affecting past timestamps       New zone Europe/Kirov, split off from Europe/Volgograd. It covers    Kirov Oblast, Russia, which switched from +04/+05 to +03/+04 on
1017:      Release 2016c - 2016-03-23 00:51:27 -0700    -  Changes affecting future time stamps +  Changes affecting future timestamps       Azerbaijan no longer observes DST. (Thanks to Steffen Thorsen.)   
1028:    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 +  Changes affecting past timestamps       Europe/Kaliningrad and Europe/Vilnius changed from +03/+04 to    +02/+03 on 1989-03-26, not 1991-03-31. Europe/Volgograd changed
1053:    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 +  Changes affecting future timestamps       New zones Europe/Astrakhan and Europe/Ulyanovsk for Astrakhan and    Ulyanovsk Oblasts, Russia, both of which will switch from +03 to +04 on
1077:    (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 +  Changes affecting past timestamps       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.
1112:      Release 2016a - 2016-01-26 23:28:02 -0800    -  Changes affecting future time stamps +  Changes affecting future timestamps       America/Cayman will not observe daylight saving this year after all.    Revert our guess that it would. (Thanks to Matt Johnson.)
1124:    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 +  Changes affecting past and future timestamps       America/Metlakatla switched from PST all year to AKST/AKDT on    2015-11-01 at 02:00. (Thanks to Steffen Thorsen.)
1133:    backward compatibility link to America/Tijuana. Its contents were    apparently based on a misreading of Mexican legislation.    -  Changes affecting past time stamps +  Changes affecting past timestamps       Asia/Karachi's two transition times in 2002 were off by a minute.    (Thanks to Matt Johnson.)
1167:      Release 2015g - 2015-10-01 00:39:51 -0700    -  Changes affecting future time stamps +  Changes affecting future timestamps       Turkey's 2015 fall-back transition is scheduled for Nov. 8, not Oct. 25.    (Thanks to Fatih.)
1182:    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 +  Changes affecting past timestamps       Norfolk observed DST from 1974-10-27 02:00 to 1975-03-02 02:00.   
1212:      Release 2015f - 2015-08-10 18:06:56 -0700    -  Changes affecting future time stamps +  Changes affecting future timestamps       North Korea switches to +0830 on 2015-08-15. (Thanks to Steffen Thorsen.)    The abbreviation remains "KST". (Thanks to Robert Elz.)
1220:    Uruguay no longer observes DST. (Thanks to Steffen Thorsen    and Pablo Camargo.)    -  Changes affecting past and future time stamps +  Changes affecting past and future timestamps       Moldova starts and ends DST at 00:00 UTC, not at 01:00 UTC.    (Thanks to Roman Tudos.)
1279:      Release 2015e - 2015-06-13 10:56:02 -0700    -  Changes affecting future time stamps +  Changes affecting future timestamps       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.)
1307:      Release 2015d - 2015-04-24 08:09:46 -0700    -  Changes affecting future time stamps +  Changes affecting future timestamps       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 +  Changes affecting past timestamps       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.
1333:      Release 2015c - 2015-04-11 08:55:55 -0700    -  Changes affecting future time stamps +  Changes affecting future timestamps       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 +  Changes affecting past timestamps    -  The following changes affect some pre-1991 Chile-related time stamps +  The following changes affect some pre-1991 Chile-related timestamps    in America/Santiago, Antarctica/Palmer, and Pacific/Easter.       The 1910 transition was January 10, not January 1.
1367:    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. +  from an existing zone only for older timestamps. As usual, +  this change affects UT offsets in pre-1970 timestamps only.    The zone's old contents have been moved to the 'backzone' file.    The affected zone is America/Montreal.   
1381:      Release 2015b - 2015-03-19 23:28:11 -0700    -  Changes affecting future time stamps +  Changes affecting future timestamps       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.
1391:    correct the fall 2014 transition from September 26 to October 24.    Adjust future predictions accordingly. (Thanks to Steffen Thorsen.)    -  Changes affecting past time stamps +  Changes affecting past timestamps       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. +  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: America/Antigua, America/Cayman,    Pacific/Midway, and Pacific/Saipan.
1429:      Release 2015a - 2015-01-29 22:35:20 -0800    -  Changes affecting future time stamps +  Changes affecting future timestamps       The Mexican state of Quintana Roo, represented by America/Cancun,    will shift from Central Time with DST to Eastern Time without DST
1442:    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 +  Changes affecting past timestamps       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. +  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: Asia/Aden, Asia/Bahrain, Asia/Kuwait,    and Asia/Muscat.
1481:      Release 2014j - 2014-11-10 17:37:11 -0800    -  Changes affecting current and future time stamps +  Changes affecting current and future timestamps       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 +  Changes affecting past timestamps    -  Many pre-1989 time stamps have been corrected for Asia/Seoul and +  Many pre-1989 timestamps 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. +  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/Addis_Ababa, Africa/Asmara,    Africa/Dar_es_Salaam, Africa/Djibouti, Africa/Kampala,
1512:      Release 2014i - 2014-10-21 22:04:57 -0700    -  Changes affecting future time stamps +  Changes affecting future timestamps       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
1532:    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 +  Changes affecting past timestamps    -  Many time stamps have been corrected for Asia/Ho_Chi_Minh before 1976 +  Many timestamps 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 +  they differed from existing zones only for older timestamps. As +  usual, these changes affect pre-1970 timestamps only. Their old    contents have been moved to the 'backzone' file.       Changes affecting code
1682:       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, +  timezones. 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
1696:    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. +  and it can help zdump better diagnose invalid timezone 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,
1712:    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. +  unsigned time_t in timezones 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.
2036:    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>. +  This works around GNOME glib bug 878 +  <https://gitlab.gnome.org/GNOME/glib/issues/878>    (Thanks to Leonardo Chiquitto for reporting the bug, and to    Arthur David Olson and James Cloos for suggesting improvements to the fix.)   
3490:    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 +  There are also changes to handle POSIX-style "quoted" timezone    environment variables.       The changes were circulated on the time zone mailing list; the only
3816:   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 +  of DST-specifying timezone 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.   
3941:      Release code1997h-data1997j - 1997-12-18 17:47:35 -0500    -  minor changes to put "TZif" at the start of each time zone information file +  minor changes to put "TZif" at the start of each timezone information file       a rule has also been added to the Makefile so you can    make zones
4451:   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). + the release (if all else fails; these are marked with a time zone + abbreviation 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.