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 tzdata2016h from ftp://ftp.iana.org/tz/releases * 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.) * 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.) * 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.) * 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. * 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.)
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 tzdata2016e from ftp://ftp.iana.org/tz/releases * 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. * 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.)
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 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 tzdata2015b from ftp://ftp.iana.org/tz/releases 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 UTC offsets in pre-1970 time stamps only. 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 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.
Sync zoneinfo database with tzdata2014h from ftp://ftp.iana.org/tz/releases We're coming from tzdata2014e. Changes affecting future time stamps: * Russia will subtract an hour from most of its time zones on 2014-10-26 at 02:00 local time. (Thanks to Alexander Krivenyshev.) * Turks & Caicos is switching from US eastern time to UTC-4 year-round, modeled as a switch from EST/EDT to AST on 2014-11-02 at 02:00. * Tons of changes to past time stamps and cleanup. It's really too much to repeat here. Please see the NEWS file for further information.
Sync zoneinfo database with tzdata2013d from ftp://ftp.iana.org/tz/releases * africa: Morocco's midsummer transitions this year are July 7 and August 10, not July 9 and August 8. (Thanks to Andrew Paprocki.) * asia: Israel now falls back on the last Sunday of October. (Thanks to Ephraim Silverberg.) * iso3166.tab: Fix typos in the entries for country codes BQ and SX. * zone.tab: Specify Jerusalem's location more precisely; this changes the pre-1880 times by 2 s. * miscellaneous files: Deemphasize the significance of national borders. Update several URLs. Spelling fixes (thanks to Kevin Lyda and Jonathan Leffler).
Sync zoneinfo database with tzdata2011a from elsie.nci.nih.gov australasia: 8.20 -> 8.22 northamerica: 8.34 -> 8.39 Theory: 8.5 -> 8.6 * australasia: Simplification and gratuitous optimization of South Australia rules. * northamerica: Changes to Hawaiian time history (from an article by Schmitt and Cox): abandoned local mean time in 1896 rather than 1900; used DST during World War II. * Theory: Add section on scope of the database.
Sync zoneinfo database with tzdata2010n from elsie.nci.nih.gov Theory: 8.4 -> 8.5 asia: 8.61 -> 8.62 australasia: 8.18 -> 8.19 factory: 8.2 -> n/a zone.tab: 8.37 -> 8.38 * Remove the 'factory' file and references to it. It is no longer needed. * asia: No DST in Hong Kong in 1977 (thanks to Jesper Norgaard for finding the problem). * australasia: Change end of DST in Samoa in 2011 from 2011-04-03 0:00 to 2011-04-03 1:00 (thanks to Raymond Hughes for a reference). * zone.tab: Remove obsolete association of Vostok Station with South Magnetic Pole; add association with Lake Vostok (thanks to Petr Machata for finding the problem).
Sync zoneinfo database with tz{code,data}2009t from elsie. Theory: 8.3 -> 8.4 asia: 8.44 -> 8.48 europe: 8.24 -> 8.25 zone.tab: 8.29 -> 8.31 Theory "Calendrical Calculations" updated (thanks to Steve Ward). asia Hong Kong comments corrected; Xinjiang comments added. europe Russian region comments updated (thanks to Oscar van Vlijmen) zone.tab version change only
Sync zoneinfo database with tzdata2009h from elsie. README: 8.2 -> 8.3 Theory: 8.2 -> 8.3 africa: 8.19 -> 8.21 antarctica: 8.4 -> 8.5 asia: 8.30 -> 8.32 australasia: 8.9 -> 8.11 backward: 8.7 -> 8.8 etcetera: 8.1 -> 8.2 europe: 8.20 -> 8.21 factory: 8.1 -> 8.2 iso3166.tab: 8.5 -> 8.6 leapseconds: 8.7 -> 8.8 northamerica: 8.27 -> 8.28 southamerica: 8.34 -> 8.36 systemv: 8.1 -> 8.2 zone.tab: 8.26 -> 8.28 From Arthur David Olson's comments: * "Public domain" statements are added to a number of files. * Instances of "=3D" are changed to "=" in the "africa" and "southamerica" files. * The start of DST in Jordan from 2002 forward is changed from 0:00 on the last Friday of the month to 24:00 on the last Thursday. * Four sets of latitute/longitude are corrected in the "zone.tab" file (with thanks to Marc Wick). * Commentary is added to the "australasia" file regarding DST in South Australia (no changes to the rules).
Sync zoneinfo database with tzdata2007d from elsie. Theory: 8.1 -> 8.2 asia: 8.8 -> 8.10 australasia: 8.5 -> 8.6 europe: 8.8 -> 8.10 leapseconds: 8.2 -> 8.3 northamerica: 8.12 -> 8.15 southamerica: 8.9 -> 8.10 zone.tab: 8.9 -> 8.10 From Paul Eggert's comments: Changes affecting current time stamps * Cuba observed DST starting Sunday. * Resolute, Nunavut switched from Central to Eastern time last November. (Thanks to Chris Walton.) Changes affecting near-future time stamps. * Mongolia has abolished DST. (Thanks to Ganbold Ts.) * Turkey will use EU rules this year, changing at 01:00 UTC rather than 01:00 standard time. (Thanks to Steffen Thorsen.) Changes affecting historical time stamps * Indonesia couldn't have switched from JST on August 1, 1945. Use September 23 instead, as we have a source for that date. Similarly, change Jayapura's 1944-01-01 to 1944-09-01. (Thanks to JohnTWB.) * Pangnirtung was founded in 1921, so it couldn't have been observing local time before that. Similarly, Iqaluit was founded August 1942, Rankin Inlet 1957, Cambridge Bay 1920, Yellowknife 1935, Inuvik 1953. (Some of these dates are approximate; corrections welcome.) Changes affecting comments only * Ecuador observed DST in 1992, but we have no data. (Thanks to Ron Echeverri.) * We have more formal announcements for Canada. (Thanks to Chris Walton.) * Wisconsin's legal time now matches the US's. (Thanks to Douglas R. Bomberg.)