Sync zoneinfo database with tzdata2020a from ftp://ftp.iana.org/tz/releases * Morocco's second spring-forward transition in 2020 will be May 31, not May 24 as predicted earlier. (Thanks to Semlali Naoufal.) * Canada's Yukon advanced to -07 year-round on 2020-03-08. * America/Nuuk renamed from America/Godthab. * Shanghai observed DST in 1919. (Thanks to Phake Nick.) * To reflect current usage in English better, America/Godthab has been renamed to America/Nuuk. A backwards-compatibility link remains for the old name. For a detailed list of changes, see share/zoneinfo/NEWS.
Sync zoneinfo database with tzdata2019b from ftp://ftp.iana.org/tz/releases * Brazil has canceled DST and will stay on standard time indefinitely. * Predictions for Morocco now go through 2087 instead of 2037. * Palestine's 2019 spring transition was 03-29 at 00:00, not 03-30 at 01:00. * Fix various past transitions for Hong Kong and Italy. For a detailed list of changes, see share/zoneinfo/NEWS.
Sync zoneinfo database with tzdata2018i from ftp://ftp.iana.org/tz/releases * Qyzylorda, Kazakhstan moved from +06 to +05 on 2018-12-21. * New zone Asia/Qostanay because Qostanay, Kazakhstan didn't move. * Metlakatla, Alaska observes PST this winter only. * Guess Morocco will continue to adjust clocks around Ramadan. * Add predictions for Iran from 2038 through 2090. * São Tomé and Príncipe switches from +01 to +00 on 2019-01-01. For a detailed list of changes, see share/zoneinfo/NEWS.
Sync zoneinfo database with tzdata2018f from ftp://ftp.iana.org/tz/releases * 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. * Use PST and PDT for Philippine time. * Various adjustments to past timestamps. * Miscellaneous fixes and adjustments. For a detailed list of changes, see share/zoneinfo/NEWS.
Sync zoneinfo database with tzdata2018b from ftp://ftp.iana.org/tz/releases * Sao Tome and Principe switched from +00 to +01. * Brazil's DST will now start on November's first Sunday. * A discrepancy of 4 s in timestamps before 1931 in South Sudan has been corrected. * The abbreviation invented for Bolivia Summer Time (1931-2) is now BST instead of BOST. * Various smaller adjustments. For a detailed list of changes, see share/zoneinfo/NEWS.
Sync zoneinfo database with tzdata2017c from ftp://ftp.iana.org/tz/releases * 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. For a detailed list of changes, see share/zoneinfo/NEWS.
Sync zoneinfo database with tzdata2017a from ftp://ftp.iana.org/tz/releases * 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. * 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.) * 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 zone. Similarly, switch from invented to numeric time zone abbreviations for a number of other zones. * 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. * Move the Pacific/Johnston link from 'australasia' to 'backward', since Johnston is now uninhabited. * africa (Africa/Monrovia): The 1972 transition was on January 7, not May 1. (Shanks was wrong again! and Howse was right.) * The 'Theory' file now better documents choice of historical time zone abbreviations. (Problems reported by Michael Deckers.)
Sync zoneinfo database with tzdata2016j from ftp://ftp.iana.org/tz/releases * 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.) * The new zone Asia/Atyrau for Atyraū Region, Kazakhstan, is like Asia/Aqtau except it switched from +04/+05 to +05/+06 in spring 1999, not fall 1994. (Thanks to Stepan Golosunov.) * Asia/Gaza and Asia/Hebron now use "EEST", not "EET", to denote summer time before 1948. The old use of "EET" was a typo. * 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.)
Sync zoneinfo database with tzdata2016i from ftp://ftp.iana.org/tz/releases * 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. * 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.) * 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.
Sync zoneinfo database with tzdata2016g from ftp://ftp.iana.org/tz/releases * 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.) * 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.) * 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. * Rename Asia/Rangoon to Asia/Yangon, with a backward compatibility link. (Thanks to David Massoud.) * Comments now cite URLs for some 1917-1921 Russian DST decrees. (Thanks to Alexander Belopolsky.)
Sync zoneinfo database with tzdata2016d from ftp://ftp.iana.org/tz/releases * America/Caracas switches from -0430 to -04 on 2016-05-01 at 02:30. (Thanks to Alexander Krivenyshev for the heads-up.) * Asia/Magadan switched 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.) * 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. * Mention Internet RFCs 7808 (TZDIST) and 7809 (CalDAV time zone references).
Sync zoneinfo database with tzdata2016c from ftp://ftp.iana.org/tz/releases * 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.) * 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.) * Several updates and URLs for historical and proposed Russian changes. (Thanks to Stepan Golosunov, Matt Johnson, and Alexander Krivenyshev.)
Sync zoneinfo database with tzdata2016b from ftp://ftp.iana.org/tz/releases * New zones Europe/Astrakhan, Europe/Ulyanovsk for the Russian Oblasts (their post-1970 histories differ), and Asia/Barnaul for Altai Krai and Altai Republic, Russia. Also, Asia/Sakhalin moves from +10 to +11 on March 27, 2016. (Thanks to Alexander Krivenyshev for the heads-up, and to Matt Johnson and Stepan Golosunov for followup.) * Haiti will not observe DST in 2016. (Thanks to Jean Antoine via Steffen Thorsen.) * Palestine's spring-forward transition on March 26, 2016 is at 01:00, not 00:00. (Thanks to Hannah Kreitem.) * 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.) * Comments in zone tables have been improved. (Thanks to J William Piggott.) * 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.)
Sync zoneinfo database with tzdata2016a from ftp://ftp.iana.org/tz/releases * 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. * 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. * Asia/Karachi's two transition times in 2002 were off by a minute. (Thanks to Matt Johnson.) * 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.)
Sync zoneinfo database with tzdata2015g from ftp://ftp.iana.org/tz/releases * 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.) * Norfolk observed DST from 1974-10-27 02:00 to 1975-03-02 02:00. * 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.)
Sync zoneinfo database with tzdata2015f from ftp://ftp.iana.org/tz/releases * asia: North Korea switches to +0830 on 2015-08-15. (Thanks to Steffen Thorsen.) The abbreviation remains "KST". (Thanks to Robert Elz.) * europe: Moldova starts and ends DST at 00:00 UTC, not at 01:00 UTC. (Thanks to Roman Tudos.) Also mention that Herbert Samuel introduced the term "Summer Time". * northamerica: Comments for America/Halifax and America/Glace_Bay have been improved. (Thanks to Brian Inglis.) * southamerica: Uruguay no longer observes DST. (Thanks to Steffen Thorsen and Pablo Camargo.) * Theory: The Theory file mentions naming issues earlier, as these seem to be poorly publicized (thanks to Gilmore Davidson for reporting the problem). * Various: 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.)
Sync zoneinfo database with tzdata2015a from ftp://ftp.iana.org/tz/releases 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 UTC offsets in pre-1970 time stamps only. The affected zones are: Asia/Aden, Asia/Bahrain, Asia/Kuwait, and Asia/Muscat. Changes affecting commentary * The leapseconds file commentary now mentions the expiration date. (Problem reported by Martin Burnicki.) * Update Mexican Library of Congress URL.