Rebase to tzdata-2023a
- Egypt reintroduced DST, from April through October.
- Morocco springs forward April 23, not April 30.
- Palestine delayed the start of DST this year.
Rebase to tzdata-2022g
- The northern edge of the Mexican state of Chihuahua will
change time zone to agree with nearby US locations on
2022-11-30.
- Added a new Zone America/Ciudad_Juarez that splits from
America/Ojinaga.
Rebase to tzdata-2022f
- Mexico will stop observing DST except near the US border.
- Chihuahua moved to -06 year round starting on 2022-10-30.
- Fiji no longer observes DST.
Rebase to tzdata-2022d
- Palestine DST transition will be on October 29, 2022,
not October 28, 2022.
- Europe/Uzhgorod and Europe/Zaporozhye are moved to 'backzone'.
Rebase to tzdata-2022c - supersedes tzdata-2022b
- Add a work-around for an awk bug in FreeBSD, macOS, etc.
- Improve tzselect with respect to intercontinental Zones.
Rebase to tzdata-2022b
- Chile transitions to DST on 2022-09-11, not 2022-09-04
- 'make install' now defaults LOCALTIME to Factory rather than GMT
- More zones that are the same since 1970 have been moved to backzone.
- Include patch for awk workaround.
Rebase to tzdata-2022a
- Palestine springs forward on 2022-03-27, not 2022-03-26.
- zdump -v now outputs better failure information.
- bug fixes for code that reads corrupted TZif data.
Rebase to tzdata-2021e - supersedes tzdata-2021d
- Pacific/Fiji suspended DST for the 2021/2022 season.
- 'zic -r' now marks unspecified timestamps with "-00".
- Palestine will fall back 2021-10-29 at 01:00, rather
than the predicted 2021-10-30.
Rebase to tzdata-2021c
- Revert most 2021b changes to the 'backward' file.
- Fix 'zic -b fat' bug in pre-1970 32-bit data reported in tzdata-2021b.
- Fix two Link line typos from tzdata-2021b.
- Distribute the new SECURITY file.
Rebase to tzdata-2021b
- Jordan now starts DST on February's last Thursday.
- Samoa no longer observes DST.
- Merge more location-based Zones whose timestamps agree since 1970.
- Move some backward-compatibility links to 'backward'.
- Rename Pacific/Enderbury to Pacific/Kanton.
- Correct many pre-1993 transitions in Malawi, Portugal, etc.
- zic now creates each output file or link atomically.
- zic -L no longer omits the POSIX TZ string in its output.
- zic fixes for truncation and leap second table expiration.
- zic now follows POSIX for TZ strings using all-year DST.
- Fix some localtime crashes and bugs in obscure cases.
- zdump -v now outputs more-useful boundary cases.
- tzfile.5 better matches a draft successor to RFC 8536.
Rebase to tzdata-2020f including changes for tzdata-2020e
- tzdata-2020f fixes a bug in tzdata-2020e that caused an
invalid zi file in rearguard format
- Volgograd changes time zone from UTC+04 to UTC+03 on 2020-12-27.
- Australia/Currie is identical to Australia/Hobart for all
timestamps since 1970 and was therefore created by mistake,
now moved to the "backward" file.
- Rebase to tzdata-2020d including changes from tzdata-2020c
- Palestine will end summer time on 2020-10-24 rather than the
predicted 2020-10-31.
- Fiji starts DST later than usual, on 2020-12-20.
- Rearguard now provides an empty file pacificnew to support
downstream software that expects it.
Rebase to tzdata-2020b
- Yukon timezones represented by America/Whitehorse and
America/Dawson will change time zone rules from -08/-07 to
permanent -07 on 2020-11-01, not on 2020-03-08 as 2020a had it.
- The most recent winter(+08)/summer(+11) transition for Casey Station,
Antarctica was 2020-10-04 00:01.
- Remove obsolete files pacificnew, systemv, and yearistype.sh
from the distribution.
- Rebase to tzdata-2020a
- Morocco will spring forward on 2020-05-31 rather than
previously predicted 2020-05-24.
- Canada's Yukon region changed to year round UTC -07
effective 2020-03-08.
- America/Godthab was renamed to America/Nuuk.
- Rebase to tzdata-2019c
- Fiji will observe DST from 2019-11-10 to 2020-01-12.
- Norfolk Island will begin observing Australian-style DST on 2019-10-06.
- Add Factory back in to be more consistent with upstream.
- Rebase to tzdata-2019a
- Palestine will start DST on 2019-03-30, rather than 2019-03-23 as
previously predicted.
- Metlakatla rejoined Alaska time on 2019-01-20, ending its observances
of Pacific standard time.
- São Tomé and Príncipe changed from UTC+01 to UTC+00 on 2019-01-01.
- Qyzylorda, Kazakhstan changed from UTC+06 to UTC+05 on 2018-12-21.
- Created a new zone Asia/Qostanay since Qostanay, Kazakhstan didn't
transition with the Qyzylorda change.
- Metlakatla, Alaska will observe PST for this winter only.
- Predict that Morocco will continue to adjust clocks around Ramadan.
- Also include predictions for Iran from 2038 through 2090.
- Morocco will change from UTC+00/+01 to permanent +01 effective 2018-10-27.
- Includes changes for tzdata-2018f.
- Volgograd will change from UTC+03 to UTC+04 on 2018-10-28 at 02:00.
- Fiji will end DST on 2019-01-13 instead of the 2019-01-20 as
previously predicted.
- Most of Chile will end DST on the first Saturday in April at 24:00
and restart DST on the first Saturday in September at 24:00.
- Morocco will change from UTC+00/+01 to permanent +01 effective 2018-10-27.
- Rebase to tzdata-2018e
- North Korea changed from UTC+8:30 to UTC+9 on May 5, 2018.
- In this update, the upstream project now defaults to using
the "vanguard" data implementation which includes negative DST offsets.
- Rebase to tzdata-2018d:
- DST for Asia/Gaza and Asia/Hebron has changed from March 31 to March 24.
- Antarctica/Casey station changed to UTC+8 on March 11.
- Rebase to tzdata-2018c:
- São Tomé and Príncipe changed from +00 to +01 on January 1, 2018
- Brazil's DST will start on the first Sunday in November
- Support for the new zic -t option.
- Add back pacificnew file omitted in tzdata-2018a
- Rebase to tzdata-2017c
- Northern Cyprus will revert to using EQ rules on October 29, 2017.
- Sudan will switch from +03 to +02 on November 1, 2017.
- Tonga will not change it's clocks on Novemeber 5, 2017 ending it's
experiment with DST.
- Fiji DST will end on January 14, 2018 rather than January 21, 2018.
- Namibia - starting September 3, 2017 switches from +)1 with DST to
+02 all year. This change takes effect April 1, 2018.
- Turks & Caicos changes from -04 all year to -05 with US DST starting
on March 11, 2018. Effective change date is November 4, 2018.
- tzdata now includes two text versions of the time zone data - tzdata.zi
and leapseconds.
- Includes two patches to deal with build issues.
Rebase to tzdata-2017a:
- Mongolia no longer observes DST
- The Magallanes region of Chile will go from -04/-03 to -03 year round,
resulting in a new time zone America/Punta_Arenas.
- Rebase to 2016i
- Pacific/Tongatapu now begins DST on 2016-11-06 at 02:00 and ends
on 2017-01-15 at 03:00.
- Northern Cyprus is changed to +03 year round. This results in a
split in Cyprus time zones starting 2016-10-30 at 04:00 and
creates a new zone - Asia/Famagusta.
- Antarctica/Casey changed from +08 to +11 on 2016-10-22.
- Rebase to 2016g
- Turkey permanently switches from +02 to +03 as of 2016-09-07,
- Per IERS Bulletin C 52, leap second to be added on 2016-09-31 at 23:59:60.
- Rebase to 2016d
- America/Caracas switches from -0430 to -04 on 2016-05-01 at 02:30.
- Asia/Magadan switchefrom +10 to +11 on 2016-04-24 at 02:00.
- 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.
- Rebase to 2016b
- 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.
- 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.
- Palestine's spring-forward transition on 2016-03-26 is at 01:00, not 00:00.
Guess future transitions will be March's last Saturday at 01:00, not March's
last Friday at 24:00.
- Rebase to 2016a
- America/Cayman will not observe daylight saving this year after all.
Revert our guess that it would.
- Asia/Chita switches from +0800 to +0900 on 2016-03-27 at 02:00.
- 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.
- Rebase to 2015g
- Turkey's 2015 fall-back transition is scheduled for Nov. 8, not Oct. 25.
- Norfolk moves from +1130 to +1100 on 2015-10-04 at 02:00 local time.
- Fiji's 2016 fall-back transition is scheduled for January 17, not 24.
- 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.
- Rebase to 2015d
- Egypt will not observe DST in 2015 and will consider canceling it
permanently. For now, assume no DST indefinitely.
- 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.
- Rebase to tzdata-2015c
- 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.
- Rebase javazic tool to match latest upstream OpenJDK version
- 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.
- 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.
- New leap second 2015-06-30 23:59:60 UTC as per IERS Bulletin C 49.
- 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.
- 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.
- Rebase to 2014j
- Turks & Caicos' switch from US eastern time to UTC-4 year-round
did not occur on 2014-11-02 at 02:00. It's currently scheduled
for 2015-11-01 at 02:00.
- Pacific/Fiji will observe DST from 2014-11-02 02:00 to 2015-01-18 03:00.
- A new Zone Pacific/Bougainville, for the part of Papua New Guinea
that plans to switch from UTC+10 to UTC+11 on 2014-12-28 at 02:00
Rebase to 2014g
- 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.
