Branch: Tag:

2017-03-05

2017-03-05 08:07:27 by Henrik Grubbström (Grubba) <grubba@grubba.org>

Updated to 2017a.

1:   News for the tz database    + 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.
13:    Changes to past time stamps       The new zone Asia/Atyrau for Atyraū Region, Kazakhstan, is like -  Asia/Aqtau except it switched from +04/+05 to +05/+06 in spring +  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
911:    been fixed. (Thanks to Christos Zoulas for reporting most of    these problems and for suggesting fixes.)    -  If USG_COMPAT is defined and the requested time stamp is standard time, +  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 time stamp; and +  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 time stamp is out of range, rather +  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.
937:      Release 2014h - 2014-09-25 18:59:03 -0700    -  Changes affecting past time stamps +  Changes affecting past timestamps       America/Jamaica's 1974 spring-forward transition was Jan. 6, not Apr. 28.   
945:    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 time stamps. As usual, -  these changes affect UTC offsets in pre-1970 time stamps only. +  from existing zones only for older timestamps. As usual, +  these changes affect UTC 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,
958:    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 time stamp, and zdump now uses this +  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.)   
998:      Release 2014g - 2014-08-28 12:31:23 -0700    -  Changes affecting future time stamps +  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 time stamps +  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,
1014:    Vladimir Karpinsky.)       The Portuguese decree of 1911-05-26 took effect on 1912-01-01. -  This affects 1911 time stamps in Africa/Bissau, Africa/Luanda, +  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.)
1022:    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 time stamps, although it is out of scope for +  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.
1030:    Isle of Man entries.)       Some more zones have been turned into links, when they differed -  from existing zones only for older time stamps. As usual, -  these changes affect UTC offsets in pre-1970 time stamps only. +  from existing zones only for older timestamps. As usual, +  these changes affect UTC 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,
1082:    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 time stamps near +  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
1155:      Release 2014f - 2014-08-05 17:42:36 -0700    -  Changes affecting future time stamps +  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.)
1206:    These abbreviations are now used for time in Korea, Taiwan,    and Sakhalin while controlled by Japan.    -  Changes affecting past time stamps +  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 time stamps before May 1980. Asia/Urumqi's +  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 UTC offsets where data entries were likely invented. -  These changes affect UTC offsets in pre-1970 time stamps only. This is +  These changes affect UTC 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,
1364:      Release 2014e - 2014-06-12 21:53:52 -0700    -  Changes affecting near-future time stamps +  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
1376:    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 time stamps +  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
1394:       Changes affecting code    -  zic no longer generates files containing time stamps before the Big Bang. +  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
1407:      Release 2014c - 2014-05-13 07:44:13 -0700    -  Changes affecting near-future time stamps +  Changes affecting near-future timestamps       Egypt observes DST starting 2014-05-15 at 24:00.    (Thanks to Ahmad El-Dardiry and Gunther Vermier.)
1421:    Changes affecting code       zic now generates transitions for minimum time values, eliminating guesswork -  when handling low-valued time stamps. (Thanks to Arthur David Olson.) +  when handling low-valued timestamps. (Thanks to Arthur David Olson.)       Port to Cygwin sans glibc. (Thanks to Arthur David Olson.)   
1432:      Release 2014b - 2014-03-24 21:28:50 -0700    -  Changes affecting near-future time stamps +  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.
1471:      Release 2014a - 2014-03-07 23:30:29 -0800    -  Changes affecting near-future time stamps +  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 time stamps +  Changes affecting past timestamps       Fiji ended DST on 2014-01-19 at 02:00, not the previously-scheduled 03:00.    (Thanks to Steffen Thorsen.)
1540:      Release 2013i - 2013-12-17 07:25:23 -0800    -  Changes affecting near-future time stamps: +  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 time stamps: +  Changes affecting past timestamps:       In 2004, Cuba began DST on March 28, not April 4.    (Thanks to Steffen Thorsen.)
1570:      Release 2013h - 2013-10-25 15:32:32 -0700    -  Changes affecting current and future time stamps: +  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.)
1578:    Western Sahara (Africa/El_Aaiun) uses Morocco's DST rules.    (Thanks to Gwillim Law.)    -  Changes affecting future time stamps: +  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.
1629:      Release 2013g - 2013-09-30 21:08:26 -0700    -  Changes affecting current and near-future time stamps +  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
1662:      Release 2013f - 2013-09-24 23:37:36 -0700    -  Changes affecting near-future time stamps +  Changes affecting near-future timestamps       Tocantins will very likely not observe DST starting this spring.    (Thanks to Steffen Thorsen.)
1709:      Release 2013e - 2013-09-19 23:50:04 -0700    -  Changes affecting near-future time stamps +  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
1727:    Use ART (UT -03, standard time), rather than WARST (also -03, but    daylight saving time) for San Luis, Argentina since 2009.    -  Changes affecting Godthåb time stamps after 2037 if version mismatch +  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 time stamps for America/Godthab, America/Santiago, +  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.)
1751:    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 time stamps before 2038. Existing version-2-based client code +  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 time stamps after +  files, and typically works in practice even for timestamps after    2037; the only known exception is America/Godthab.    -  Changes affecting time stamps before 1970 +  Changes affecting timestamps before 1970       Pacific/Johnston is now a link to Pacific/Honolulu. This corrects    some errors before 1947.
1764:    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 time stamps before 1943. The affected zones are: +  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,
1774:    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 time stamps +  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 time stamps from 1853 to 1894. (Thanks +  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
1796:    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 -  time stamps that this file represents, so zdump outputs the same +  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
1828:    Changes affecting the zdump utility       zdump now outputs "UT" when referring to Universal Time, not "UTC". -  "UTC" does not make sense for time stamps that predate the introduction +  "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.)   
1839:       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 time stamps. The data entries for +  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
1899:       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 time stamps are wrong or +  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).   
1934:      Release 2013d - 2013-07-05 07:38:01 -0700    -  Changes affecting future time stamps: +  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.)
1942:    Israel now falls back on the last Sunday of October.    (Thanks to Ephraim Silverberg.)    -  Changes affecting past time stamps: +  Changes affecting past timestamps:       Specify Jerusalem's location more precisely; this changes the pre-1880    times by 2 s.
1980:      Release 2013c - 2013-04-19 16:17:40 -0700    -  Changes affecting current and future time stamps: +  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,
1991:    by moving the end of DST to the 4th Sunday in March every year.    (Thanks to Carlos Raúl Perasso.)    -  Changes affecting past time stamps: +  Changes affecting past timestamps:       Fix some historical data for Palestine to agree with that of    timeanddate.com, as follows:
2025:      Release 2013b - 2013-03-10 22:33:40 -0700    -  Changes affecting current and future time stamps: +  Changes affecting current and future timestamps:       Haiti uses US daylight-saving rules this year, and presumably future years. -  This changes time stamps starting today. (Thanks to Steffen Thorsen.) +  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.
2052:    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 time stamps: +  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.
2061:    New Zones Asia/Khandyga, Asia/Ust-Nera, Europe/Busingen.    (Thanks to Tobias Conradi and Arthur David Olson.)    -  Many changes affect historical time stamps before 1940. +  Many changes affect historical timestamps before 1940.    These were deduced from: Milne J. Civil time. Geogr J. 1899    Feb;13(2):173-94 <http://www.jstor.org/stable/1774359>.   
2193:      Release code2012c-data2012d - 2012-07-19 16:35:33 -0700    -  Changes for Morocco's time stamps, which take effect in a couple of +  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.   
2337:      Release 2011d - 2011-03-14 09:18:01 -0400    -  changes that impact present-day time stamps in Cuba, Samoa, and Turkey +  changes that impact present-day timestamps in Cuba, Samoa, and Turkey         Release 2011c - 2011-03-07 09:30:09 -0500    -  These do affect current time stamps in Chile and Annette Island, Canada. +  These do affect current timestamps in Chile and Annette Island, Canada.         Release 2011b - 2011-02-07 08:44:50 -0500
3807:   numbers. Recent releases also come in an experimental format   consisting of a single tarball tzdb-R.tar.lz with extra data.    - Release time stamps are taken from the release's commit (for newer, + 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