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- ----- 2025 -----
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- ----- 2024 -----
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- ----- 2023 -----
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- ----- 2022 -----
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- ----- 2021 -----
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- ----- 2020 -----
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- ----- 2019 -----
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- ----- 2018 -----
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- ----- 2017 -----
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- ----- 2016 -----
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- ----- 2015 -----
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- ----- 2014 -----
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- ----- 2013 -----
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- ----- 2012 -----
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- 83 discussions
The 2025b release of the tz code and data is available.
This release contains the following changes:
Briefly:
New zone for Aysén Region in Chile which moves from -04/-03 to -03.
Changes to future timestamps
Chile's Aysén Region moves from -04/-03 to -03 year-round, joining
Magallanes Region. The region will not change its clocks on
2025-04-05 at 24:00, diverging from America/Santiago and creating a
new zone America/Coyhaique. (Thanks to Yonathan Dossow.) Model
this as a change to standard offset effective 2025-03-20.
Changes to past timestamps
Iran switched from +04 to +0330 on 1978-11-10 at 24:00, not at
year end. (Thanks to Roozbeh Pournader.)
Changes to code
'zic -l TIMEZONE -d . -l /some/other/file/system' no longer
attempts to create an incorrect symlink, and no longer has a
read buffer underflow. (Problem reported by Evgeniy Gorbanev.)
Here are links to the release files:
https://www.iana.org/time-zones/repository/releases/tzcode2025b.tar.gz
https://www.iana.org/time-zones/repository/releases/tzdata2025b.tar.gz
https://www.iana.org/time-zones/repository/releases/tzdb-2025b.tar.lz
The following convenience links are also available, although they may
point to the previous release until the relevant caches are refreshed:
https://www.iana.org/time-zones/repository/tzcode-latest.tar.gz
https://www.iana.org/time-zones/repository/tzdata-latest.tar.gz
https://www.iana.org/time-zones/repository/tzdb-latest.tar.lz
Links are also available via plain HTTP, and via FTP from
ftp://ftp.iana.org/tz/releases with the same basenames as above.
Each release file has a GPG signature, which can be retrieved by
appending ".asc" to the above URLs. Copies of these signatures are
appended to this message.
This release corresponds to commit
7e1145bfdb9630c127841dc8ce808a937a300938 dated 2025-03-22 13:40:46 -0700
and tagged '2025b' in the development GitHub repository at
<https://github.com/eggert/tz>.
Here are the SHA-512 checksums for the release files:
19826b12968c10fc4db7e4b07ba782bfb8590eeebaec6f719d74b92a2e642ab817bd72bceff0015ce52a838edfdb00753b3cd87dd84b35abf2606e5bee445f76
tzcode2025b.tar.gz
7d83741f3cae81fac8131994b43c55b6da7328df18b706e5ee40e9b3212bc506e6f8fc90988b18da424ed59eff69bce593f2783b7b5f18eb483a17aeb94258d6
tzdata2025b.tar.gz
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tzdb-2025b.tar.lz
Here are GPG digital signatures for the release files:
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1
0
The 2025a release of the tz code and data is available.
This release contains the following changes:
Briefly:
Paraguay adopts permanent -03 starting spring 2024.
Improve pre-1991 data for the Philippines.
Etc/Unknown is now reserved.
Changes to future timestamps
Paraguay will stop changing its clocks after the spring-forward
transition on 2024-10-06, so it is now permanently at -03.
(Thanks to Heitor David Pinto and Even Scharning.)
This affects timestamps starting 2025-03-22, as well as the
obsolescent tm_isdst flags starting 2024-10-15.
Changes to past timestamps
Correct timestamps for the Philippines before 1900, and from 1937
through 1990. (Thanks to P Chan for the heads-up and citations.)
This includes adjusting local mean time before 1899; fixing
transitions in September 1899, January 1937, and June 1954; adding
transitions in December 1941, November 1945, March and September
1977, and May and July 1990; and removing incorrect transitions in
March and September 1978.
Changes to data
Add zone1970.tab lines for the Concordia and Eyre Bird Observatory
research stations. (Thanks to Derick Rethans and Jule Dabars.)
Changes to code
strftime %s now generates the correct numeric string even when the
represented number does not fit into time_t. This is better than
generating the numeric equivalent of (time_t) -1, as strftime did
in TZDB releases 96a (when %s was introduced) through 2020a and in
releases 2022b through 2024b. It is also better than failing and
returning 0, as strftime did in releases 2020b through 2022a.
strftime now outputs an invalid conversion specifier as-is,
instead of eliding the leading '%', which confused debugging.
An invalid TZ now generates the time zone abbreviation "-00", not
"UTC", to help the user see that an error has occurred. (Thanks
to Arthur David Olson for suggesting a "wrong result".)
mktime and timeoff no longer incorrectly fail merely because a
struct tm component near INT_MIN or INT_MAX overflows when a
lower-order component carries into it.
TZNAME_MAXIMUM, the maximum number of bytes in a proleptic TZ
string's time zone abbreviation, now defaults to 254 not 255.
This helps reduce the size of internal state from 25480 to 21384
on common platforms. This change should not be a problem, as
nobody uses such long "abbreviations" and the longstanding tzcode
maximum was 16 until release 2023a. For those who prefer no
arbitrary limits, you can now specify TZNAME_MAXIMUM values up to
PTRDIFF_MAX, a limit forced by C anyway; formerly tzcode silently
misbehaved unless TZNAME_MAXIMUM was less than INT_MAX.
tzset and related functions no longer leak a file descriptor if
another thread forks or execs at about the same time and if the
platform has O_CLOFORK and O_CLOEXEC respectively. Also, the
functions no longer let a TZif file become a controlling terminal.
'zdump -' now reads TZif data from /dev/stdin.
(From a question by Arthur David Olson.)
Changes to documentation
The name Etc/Unknown is now reserved: it will not be used by TZDB.
This is for compatibility with CLDR, which uses the string
"Etc/Unknown" for an unknown or invalid timezone. (Thanks to
Justin Grant, Mark Davis, and Guy Harris.)
Cite Internet RFC 9636, which obsoletes RFC 8536 for TZif format.
Here are links to the release files:
https://www.iana.org/time-zones/repository/releases/tzcode2025a.tar.gz
https://www.iana.org/time-zones/repository/releases/tzdata2025a.tar.gz
https://www.iana.org/time-zones/repository/releases/tzdb-2025a.tar.lz
The following convenience links are also available, although they may
point to the previous release until the relevant caches are refreshed:
https://www.iana.org/time-zones/repository/tzcode-latest.tar.gz
https://www.iana.org/time-zones/repository/tzdata-latest.tar.gz
https://www.iana.org/time-zones/repository/tzdb-latest.tar.lz
Links are also available via plain HTTP, and via FTP from
ftp://ftp.iana.org/tz/releases with the same basenames as above.
Each release file has a GPG signature, which can be retrieved by
appending ".asc" to the above URLs. Copies of these signatures are
appended to this message.
This release corresponds to commit
a8e2fcd87bc5f83fec0a76652095e8d7881b0763 dated 2025-01-15 10:47:24 -0800
and tagged '2025a' in the development GitHub repository at
<https://github.com/eggert/tz>.
Here are the SHA-512 checksums for the release files:
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tzcode2025a.tar.gz
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tzdata2025a.tar.gz
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tzdb-2025a.tar.lz
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1
0
The 2024b release of the tz code and data is available.
This release is prompted by the accumulated weight of many non-urgent
changes to both code and data. It changes one timestamp abbreviation,
for the long-obsolete System V setting TZ='MET'; see below.
Otherwise, the timestamps affected by this release all predate April
2008, so you can skip this release if your application uses only
tzdata and does not use older timestamps.
This release contains the following changes:
Briefly:
Improve historical data for Mexico, Mongolia, and Portugal.
System V names are now obsolescent.
The main data form now uses %z.
The code now conforms to RFC 8536 for early timestamps.
Support POSIX.1-2024, which removes asctime_r and ctime_r.
Assume POSIX.2-1992 or later for shell scripts.
SUPPORT_C89 now defaults to 1.
Changes to past timestamps
Asia/Choibalsan is now an alias for Asia/Ulaanbaatar rather than
being a separate Zone with differing behavior before April 2008.
This seems better given our wildly conflicting information about
Mongolia's time zone history. (Thanks to Heitor David Pinto.)
Historical transitions for Mexico have been updated based on
official Mexican decrees. The affected timestamps occur during
the years 1921-1927, 1931, 1945, 1949-1970, and 1981-1997.
The affected zones are America/Bahia_Banderas, America/Cancun,
America/Chihuahua, America/Ciudad_Juarez, America/Hermosillo,
America/Mazatlan, America/Merida, America/Mexico_City,
America/Monterrey, America/Ojinaga, and America/Tijuana.
(Thanks to Heitor David Pinto.)
Historical transitions for Portugal, represented by Europe/Lisbon,
Atlantic/Azores, and Atlantic/Madeira, have been updated based on a
close reading of old Portuguese legislation, replacing previous data
mainly originating from Whitman and Shanks & Pottenger. These
changes affect a few transitions in 1917-1921, 1924, and 1940
throughout these regions by a few hours or days, and various
timestamps between 1977 and 1993 depending on the region. In
particular, the Azores and Madeira did not observe DST from 1977 to
1981. Additionally, the adoption of standard zonal time in former
Portuguese colonies have been adjusted: Africa/Maputo in 1909, and
Asia/Dili by 22 minutes at the start of 1912.
(Thanks to Tim Parenti.)
Changes to past tm_isdst flags
The period from 1966-04-03 through 1966-10-02 in Portugal is now
modeled as DST, to more closely reflect how contemporaneous changes
in law entered into force.
Changes to data
Names present only for compatibility with UNIX System V
(last released in the 1990s) have been moved to 'backward'.
These names, which for post-1970 timestamps mostly just duplicate
data of geographical names, were confusing downstream uses.
Names moved to 'backward' are now links to geographical names.
This affects behavior for TZ='EET' for some pre-1981 timestamps,
for TZ='CET' for some pre-1947 timestamps, and for TZ='WET' for
some pre-1996 timestamps. Also, TZ='MET' now behaves like
TZ='CET' and so uses the abbreviation "CET" rather than "MET".
Those needing the previous TZDB behavior, which does not match any
real-world clocks, can find the old entries in 'backzone'.
(Problem reported by Justin Grant.)
The main source files' time zone abbreviations now use %z,
supported by zic since release 2015f and used in vanguard form
since release 2022b. For example, America/Sao_Paulo now contains
the zone continuation line "-3:00 Brazil %z", which is less error
prone than the old "-3:00 Brazil -03/-02". This does not change
the represented data: the generated TZif files are unchanged.
Rearguard form still avoids %z, to support obsolescent parsers.
Asia/Almaty has been removed from zonenow.tab as it now agrees
with Asia/Tashkent for future timestamps, due to Kazakhstan's
2024-02-29 time zone change. Similarly, America/Scoresbysund
has been removed, as it now agrees with America/Nuuk due to
its 2024-03-31 time zone change.
Changes to code
localtime.c now always uses a TZif file's time type 0 to handle
timestamps before the file's first transition. Formerly,
localtime.c sometimes inferred a different time type, in order to
handle problematic data generated by zic 2018e or earlier. As it
is now safe to assume more recent versions of zic, there is no
longer a pressing need to fail to conform RFC 8536 section 3.2,
which requires using time type 0 in this situation. This change
does not affect behavior when reading TZif files generated by zic
2018f and later.
POSIX.1-2024 removes asctime_r and ctime_r and does not let
libraries define them, so remove them except when needed to
conform to earlier POSIX. These functions are dangerous as they
can overrun user buffers. If you still need them, add
-DSUPPORT_POSIX2008 to CFLAGS.
The SUPPORT_C89 option now defaults to 1 instead of 0, fixing a
POSIX-conformance bug introduced in 2023a.
tzselect now supports POSIX.1-2024 proleptic TZ strings. Also, it
assumes POSIX.2-1992 or later, as practical porting targets now
all support that, and it uses some features from POSIX.1-2024 if
available.
Changes to build procedure
'make check' no longer requires curl and Internet access.
The build procedure now assumes POSIX.2-1992 or later, to simplify
maintenance. To build on Solaris 10, the only extant system still
defaulting to pre-POSIX, prepend /usr/xpg4/bin to PATH.
Changes to documentation
The documentation now reflects POSIX.1-2024.
Changes to commentary
Commentary about historical transitions in Portugal and her former
colonies has been expanded with links to many relevant legislation.
(Thanks to Tim Parenti.)
Here are links to the release files:
https://www.iana.org/time-zones/repository/releases/tzcode2024b.tar.gz
https://www.iana.org/time-zones/repository/releases/tzdata2024b.tar.gz
https://www.iana.org/time-zones/repository/releases/tzdb-2024b.tar.lz
The following convenience links are also available, although they may
point to the previous release until the relevant caches are refreshed:
https://www.iana.org/time-zones/repository/tzcode-latest.tar.gz
https://www.iana.org/time-zones/repository/tzdata-latest.tar.gz
https://www.iana.org/time-zones/repository/tzdb-latest.tar.lz
Links are also available via plain HTTP, and via FTP from
ftp://ftp.iana.org/tz/releases with the same basenames as above.
Each release file has a GPG signature, which can be retrieved by
appending ".asc" to the above URLs. Copies of these signatures are
appended to this message.
This release corresponds to commit
6903dde39ed637adaafc352c4b6993739253f058 dated 2024-09-04 12:27:47 -0700
and tagged '2024b' in the development GitHub repository at
<https://github.com/eggert/tz>.
Here are the SHA-512 checksums for the release files:
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tzcode2024b.tar.gz
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tzdata2024b.tar.gz
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tzdb-2024b.tar.lz
Here are GPG digital signatures for the release files:
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1
0
The 2024a release of the tz code and data is available.
This release contains the following changes:
Briefly:
Kazakhstan unifies on UTC+5 beginning 2024-03-01.
Palestine springs forward a week later after Ramadan.
zic no longer pretends to support indefinite-past DST.
localtime no longer mishandles Ciudad Juárez in 2422.
Changes to future timestamps
Kazakhstan unifies on UTC+5. This affects Asia/Almaty and
Asia/Qostanay which together represent the eastern portion of the
country that will transition from UTC+6 on 2024-03-01 at 00:00 to
join the western portion. (Thanks to Zhanbolat Raimbekov.)
Palestine springs forward a week later than previously predicted
in 2024 and 2025. (Thanks to Heba Hamad.) Change spring-forward
predictions to the second Saturday after Ramadan, not the first;
this also affects other predictions starting in 2039.
Changes to past timestamps
Asia/Ho_Chi_Minh's 1955-07-01 transition occurred at 01:00
not 00:00. (Thanks to Đoàn Trần Công Danh.)
From 1947 through 1949, Toronto's transitions occurred at 02:00
not 00:00. (Thanks to Chris Walton.)
In 1911 Miquelon adopted standard time on June 15, not May 15.
Changes to code
The FROM and TO columns of Rule lines can no longer be "minimum"
or an abbreviation of "minimum", because TZif files do not support
DST rules that extend into the indefinite past - although these
rules were supported when TZif files had only 32-bit data, this
stopped working when 64-bit TZif files were introduced in 1995.
This should not be a problem for realistic data, since DST was
first used in the 20th century. As a transition aid, FROM columns
like "minimum" are now diagnosed and then treated as if they were
the year 1900; this should suffice for TZif files on old systems
with only 32-bit time_t, and it is more compatible with bugs in
2023c-and-earlier localtime.c. (Problem reported by Yoshito
Umaoka.)
localtime and related functions no longer mishandle some
timestamps that occur about 400 years after a switch to a time
zone with a DST schedule. In 2023d data this problem was visible
for some timestamps in November 2422, November 2822, etc. in
America/Ciudad_Juarez. (Problem reported by Gilmore Davidson.)
strftime %s now uses tm_gmtoff if available. (Problem and draft
patch reported by Dag-Erling Smørgrav.)
Changes to build procedure
The leap-seconds.list file is now copied from the IERS instead of
from its downstream counterpart at NIST, as the IERS version is
now in the public domain too and tends to be more up-to-date.
(Thanks to Martin Burnicki for liaisoning with the IERS.)
Changes to documentation
The strftime man page documents which struct tm members affect
which conversion specs, and that tzset is called. (Problems
reported by Robert Elz and Steve Summit.)
Here are links to the release files:
https://www.iana.org/time-zones/repository/releases/tzcode2024a.tar.gz
https://www.iana.org/time-zones/repository/releases/tzdata2024a.tar.gz
https://www.iana.org/time-zones/repository/releases/tzdb-2024a.tar.lz
The following convenience links are also available, although they may
point to the previous release until the relevant caches are refreshed:
https://www.iana.org/time-zones/repository/tzcode-latest.tar.gz
https://www.iana.org/time-zones/repository/tzdata-latest.tar.gz
https://www.iana.org/time-zones/repository/tzdb-latest.tar.lz
Links are also available via plain HTTP, and via FTP from
ftp://ftp.iana.org/tz/releases with the same basenames as above.
Each release file has a GPG signature, which can be retrieved by
appending ".asc" to the above URLs. Copies of these signatures are
appended to this message.
This release corresponds to commit
380c07cef01c71c1f93e9709d9f8c79b91cff063 dated 2024-02-01 09:28:56 -0800
and tagged '2024a' in the development GitHub repository at
<https://github.com/eggert/tz>.
Here are the SHA-512 checksums for the release files:
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1
0
The 2023d release of the tz code and data is available.
This release contains the following changes:
Briefly:
Ittoqqortoormiit, Greenland changes time zones on 2024-03-31.
Vostok, Antarctica changed time zones on 2023-12-18.
Casey, Antarctica changed time zones five times since 2020.
Code and data fixes for Palestine timestamps starting in 2072.
A new data file zonenow.tab for timestamps starting now.
Changes to future timestamps
Ittoqqortoormiit, Greenland (America/Scoresbysund) joins most of
the rest of Greenland's timekeeping practice on 2024-03-31, by
changing its time zone from -01/+00 to -02/-01 at the same moment
as the spring-forward transition. Its clocks will therefore not
spring forward as previously scheduled. The time zone change
reverts to its common practice before 1981.
Fix predictions for DST transitions in Palestine in 2072-2075,
correcting a typo introduced in 2023a.
Changes to past and future timestamps
Vostok, Antarctica changed to +05 on 2023-12-18. It had been at
+07 (not +06) for years. (Thanks to Zakhary V. Akulov.)
Change data for Casey, Antarctica to agree with timeanddate.com,
by adding five time zone changes since 2020. Casey is now at +08
instead of +11.
Changes to past tm_isdst flags
Much of Greenland, represented by America/Nuuk, changed its
standard time from -03 to -02 on 2023-03-25, not on 2023-10-28.
This does not affect UTC offsets, only the tm_isdst flag.
(Thanks to Thomas M. Steenholdt.)
New data file
A new data file zonenow.tab helps configure applications that use
timestamps dated from now on. This simplifies configuration,
since users choose from a smaller Zone set. The file's format is
experimental and subject to change.
Changes to code
localtime.c no longer mishandles TZif files that contain a single
transition into a DST regime. Previously, it incorrectly assumed
DST was in effect before the transition too. (Thanks to Alois
Treindl for debugging help.)
localtime.c's timeoff no longer collides with OpenBSD 7.4.
The C code now uses _Generic only if __STDC_VERSION__ says the
compiler is C11 or later.
tzselect now optionally reads zonenow.tab, to simplify when
configuring only for timestamps dated from now on.
tzselect no longer creates temporary files.
tzselect no longer mishandles the following:
Spaces and most other special characters in BUGEMAIL, PACKAGE,
TZDIR, and VERSION.
TZ strings when using mawk 1.4.3, which mishandles regular
expressions of the form /X{2,}/.
ISO 6709 coordinates when using an awk that lacks the GNU
extension of newlines in -v option-arguments.
Non UTF-8 locales when using an iconv command that lacks the GNU
//TRANSLIT extension.
zic no longer mishandles data for Palestine after the year 2075.
Previously, it incorrectly omitted post-2075 transitions that are
predicted for just before and just after Ramadan. (Thanks to Ken
Murchison for debugging help.)
zic now works again on Linux 2.6.16 and 2.6.17 (2006).
(Problem reported by Rune Torgersen.)
Changes to build procedure
The Makefile is now more compatible with POSIX:
* It no longer defines AR, CC, CFLAGS, LDFLAGS, and SHELL.
* It no longer uses its own 'cc' in place of CC.
* It now uses ARFLAGS, with default specified by POSIX.
* It does not use LFLAGS incompatibly with POSIX.
* It uses the special .POSIX target.
* It quotes special characters more carefully.
* It no longer mishandles builds in an ISO 8859 locale.
Due to the CC changes, TZDIR is now #defined in a file tzfile.h
built by 'make', not in a $(CC) -D option. Also, TZDEFAULT is
now treated like TZDIR as they have similar roles.
Changes to commentary
Limitations and hazards of the optional support for obsolescent
C89 platforms are documented better, along with a tentative
schedule for removing this support.
Here are links to the release files:
https://www.iana.org/time-zones/repository/releases/tzcode2023d.tar.gz
https://www.iana.org/time-zones/repository/releases/tzdata2023d.tar.gz
https://www.iana.org/time-zones/repository/releases/tzdb-2023d.tar.lz
The following convenience links are also available, although they may
point to the previous release until the relevant caches are refreshed:
https://www.iana.org/time-zones/repository/tzcode-latest.tar.gz
https://www.iana.org/time-zones/repository/tzdata-latest.tar.gz
https://www.iana.org/time-zones/repository/tzdb-latest.tar.lz
Links are also available via plain HTTP, and via FTP from
ftp://ftp.iana.org/tz/releases with the same basenames as above.
Each release file has a GPG signature, which can be retrieved by
appending ".asc" to the above URLs. Copies of these signatures are
appended to this message.
This release corresponds to commit
cc48c2dfa2f3c21d25ab108bba978b0307ecf0e8 dated 2023-12-21 20:02:24 -0800
and tagged '2023d' in the development GitHub repository at
<https://github.com/eggert/tz>.
Here are the SHA-512 checksums for the release files:
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tzcode2023d.tar.gz
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tzdata2023d.tar.gz
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tzdb-2023d.tar.lz
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1
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The 2023c release of the tz code and data is available.
This release's code and data are identical to 2023a. In other words,
this release reverts all changes made in 2023b other than commentary, as
that appears to be the best of a bad set of short-notice choices for
modeling this week's daylight saving chaos in Lebanon. (Thanks to Rany
Hany for the heads-up about the government's announcement this week.)
Here are links to the release files:
https://www.iana.org/time-zones/repository/releases/tzcode2023c.tar.gz
https://www.iana.org/time-zones/repository/releases/tzdata2023c.tar.gz
https://www.iana.org/time-zones/repository/releases/tzdb-2023c.tar.lz
The following convenience links are also available, although they may
point to the previous release until the relevant caches are refreshed:
https://www.iana.org/time-zones/repository/tzcode-latest.tar.gz
https://www.iana.org/time-zones/repository/tzdata-latest.tar.gz
https://www.iana.org/time-zones/repository/tzdb-latest.tar.lz
Links are also available via plain HTTP, and via FTP from
ftp://ftp.iana.org/tz/releases with the same basenames as above.
Each release file has a GPG signature, which can be retrieved by
appending ".asc" to the above URLs. Copies of these signatures are
appended to this message.
This release corresponds to commit
ddb8cf09d54ecc486ed6665edcdd642abccd4eef dated 2023-03-28 12:42:14 -0700
and tagged '2023c' in the development GitHub repository at
<https://github.com/eggert/tz>.
Here are the SHA-512 checksums for the release files:
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tzcode2023c.tar.gz
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1
0
The 2023b release of the tz code and data is available. It follows so
closely on the 2023a release because Lebanon's government announced that
Lebanon's spring-forward transition previously scheduled for the end of
this week has been delayed until April 20.
This release contains the following change:
Briefly:
Lebanon delays the start of DST this year.
Changes to future timestamps
This year Lebanon springs forward April 20/21 not March 25/26.
(Thanks to Saadallah Itani.)
Here are links to the release files:
https://www.iana.org/time-zones/repository/releases/tzcode2023b.tar.gz
https://www.iana.org/time-zones/repository/releases/tzdata2023b.tar.gz
https://www.iana.org/time-zones/repository/releases/tzdb-2023b.tar.lz
The following convenience links are also available, although they may
point to the previous release until the relevant caches are refreshed:
https://www.iana.org/time-zones/repository/tzcode-latest.tar.gz
https://www.iana.org/time-zones/repository/tzdata-latest.tar.gz
https://www.iana.org/time-zones/repository/tzdb-latest.tar.lz
Links are also available via plain HTTP, and via FTP from
ftp://ftp.iana.org/tz/releases with the same basenames as above.
Each release file has a GPG signature, which can be retrieved by
appending ".asc" to the above URLs. Copies of these signatures are
appended to this message.
This release corresponds to commit
71faa2a55db2c9f21f4099b58c28536673982e0a dated 2023-03-23 19:50:38 -0700
and tagged '2023b' in the development GitHub repository at
<https://github.com/eggert/tz>.
Here are the SHA-512 checksums for the release files:
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1
0
The 2023a release of the tz code and data is available.
This release contains the following changes:
Briefly:
Egypt now uses DST again, from April through October.
This year Morocco springs forward April 23, not April 30.
Palestine delays the start of DST this year.
Much of Greenland still uses DST from 2024 on.
America/Yellowknife now links to America/Edmonton.
tzselect can now use current time to help infer timezone.
The code now defaults to C99 or later.
Fix use of C23 attributes.
Changes to future timestamps
Starting in 2023, Egypt will observe DST from April's last Friday
through October's last Thursday. (Thanks to Ahmad ElDardiry.)
Assume the transition times are 00:00 and 24:00, respectively.
In 2023 Morocco's spring-forward transition after Ramadan
will occur April 23, not April 30. (Thanks to Milamber.)
Adjust predictions for future years accordingly. This affects
predictions for 2023, 2031, 2038, and later years.
This year Palestine will delay its spring forward from
March 25 to April 29 due to Ramadan. (Thanks to Heba Hamad.)
Make guesses for future Ramadans too.
Much of Greenland, represented by America/Nuuk, will continue to
observe DST using European Union rules. When combined with
Greenland's decision not to change the clocks in fall 2023,
America/Nuuk therefore changes from -03/-02 to -02/-01 effective
2023-10-29 at 01:00 UTC. (Thanks to Thomas M. Steenholdt.)
This change from 2022g doesn't affect timestamps until 2024-03-30,
and doesn't affect tm_isdst until 2023-03-25.
Changes to past timestamps
America/Yellowknife has changed from a Zone to a backward
compatibility Link, as it no longer differs from America/Edmonton
since 1970. (Thanks to Almaz Mingaleev.) This affects some
pre-1948 timestamps. The old data are now in 'backzone'.
Changes to past time zone abbreviations
When observing Moscow time, Europe/Kirov and Europe/Volgograd now
use the abbreviations MSK/MSD instead of numeric abbreviations,
for consistency with other timezones observing Moscow time.
Changes to code
You can now tell tzselect local time, to simplify later choices.
Select the 'time' option in its first prompt.
You can now compile with -DTZNAME_MAXIMUM=N to limit time zone
abbreviations to N bytes (default 255). The reference runtime
library now rejects POSIX-style TZ strings that contain longer
abbreviations, treating them as UTC. Previously the limit was
platform dependent and abbreviations were silently truncated to
16 bytes even when the limit was greater than 16.
The code by default is now designed for C99 or later. To build in
a C89 environment, compile with -DPORT_TO_C89. To support C89
callers of the tzcode library, compile with -DSUPPORT_C89. The
two new macros are transitional aids planned to be removed in a
future version, when C99 or later will be required.
The code now builds again on pre-C99 platforms, if you compile
with -DPORT_TO_C89. This fixes a bug introduced in 2022f.
On C23-compatible platforms tzcode no longer uses syntax like
'static [[noreturn]] void usage(void);'. Instead, it uses
'[[noreturn]] static void usage(void);' as strict C23 requires.
(Problem reported by Houge Langley.)
The code's functions now constrain their arguments with the C
'restrict' keyword consistently with their documentation.
This may allow future optimizations.
zdump again builds standalone with ckdadd and without setenv,
fixing a bug introduced in 2022g. (Problem reported by panic.)
leapseconds.awk can now process a leap seconds file that never
expires; this might be useful if leap seconds are discontinued.
Changes to commentary
tz-link.html has a new section "Coordinating with governments and
distributors". (Thanks to Neil Fuller for some of the text.)
To improve tzselect diagnostics, zone1970.tab's comments column is
now limited to countries that have multiple timezones.
Note that leap seconds are planned to be discontinued by 2035.
Here are links to the release files:
https://www.iana.org/time-zones/repository/releases/tzcode2023a.tar.gz
https://www.iana.org/time-zones/repository/releases/tzdata2023a.tar.gz
https://www.iana.org/time-zones/repository/releases/tzdb-2023a.tar.lz
The following convenience links are also available, although they may
point to the previous release until the relevant caches are refreshed:
https://www.iana.org/time-zones/repository/tzcode-latest.tar.gz
https://www.iana.org/time-zones/repository/tzdata-latest.tar.gz
https://www.iana.org/time-zones/repository/tzdb-latest.tar.lz
Links are also available via plain HTTP, and via FTP from
ftp://ftp.iana.org/tz/releases with the same basenames as above.
Each release file has a GPG signature, which can be retrieved by
appending ".asc" to the above URLs. Copies of these signatures are
appended to this message.
This release corresponds to commit
f24b84a13556c12441dd55c323f9a8fd3b6fbbee dated 2023-03-22 12:39:33 -0700
and tagged '2023a' in the development GitHub repository at
<https://github.com/eggert/tz>.
Here are the SHA-512 checksums for the release files:
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tzcode2023a.tar.gz
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tzdata2023a.tar.gz
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tzdb-2023a.tar.lz
Here are GPG digital signatures for the release files:
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1
0
The 2022g release of the tz code and data is available.
This release contains the following changes:
Briefly:
The northern edge of Chihuahua changes to US timekeeping.
Much of Greenland stops changing clocks after March 2023.
Fix some pre-1996 timestamps in northern Canada.
C89 is now deprecated; please use C99 or later.
Portability fixes for AIX, libintl, MS-Windows, musl, z/OS
In C code, use more C23 features if available.
C23 timegm now supported by default
Fixes for unlikely integer overflows
Changes to future timestamps
In the Mexican state of Chihuahua, the border strip near the US
will change to agree with nearby US locations on 2022-11-30.
The strip's western part, represented by Ciudad Juárez, switches
from -06 all year to -07/-06 with US DST rules, like El Paso, TX.
The eastern part, represented by Ojinaga, will observe US DST next
year, like Presidio, TX. (Thanks to Heitor David Pinto.)
A new Zone America/Ciudad_Juarez splits from America/Ojinaga.
Much of Greenland, represented by America/Nuuk, stops observing
winter time after March 2023, so its daylight saving time becomes
standard time. (Thanks to Jonas Nyrup and Jürgen Appel.)
Changes to past timestamps
Changes for pre-1996 northern Canada (thanks to Chris Walton):
Merge America/Iqaluit and America/Pangnirtung into the former,
with a backward compatibility link for the latter name.
There is no good evidence the two locations differ since 1970.
This change affects pre-1996 America/Pangnirtung timestamps.
Cambridge Bay, Inuvik, Iqaluit, Rankin Inlet, Resolute and
Yellowknife did not observe DST in 1965, and did observe DST
from 1972 through 1979.
Whitehorse moved from -09 to -08 on 1966-02-27, not 1967-05-28.
Colombia's 1993 fallback was 02-06 24:00, not 04-04 00:00.
(Thanks to Alois Treindl.)
Singapore's 1981-12-31 change was at 16:00 UTC (23:30 local time),
not 24:00 local time. (Thanks to Geoff Clare via Robert Elz.)
Changes to code
Although tzcode still works with C89, bugs found in recent routine
maintenance indicate that bitrot has set in and that in practice
C89 is no longer used to build tzcode. As it is a maintenance
burden, support for C89 is planned to be removed soon. Instead,
please use compilers compatible with C99, C11, C17, or C23.
timegm, which tzcode implemented in 1989, will finally be
standardized 34 years later as part of C23, so timegm is now
supported even if STD_INSPIRED is not defined.
Fix bug in zdump's tzalloc emulation on hosts that lack tm_zone.
(Problem reported by Đoàn Trần Công Danh.)
Fix bug in zic on hosts where malloc(0) yields NULL on success.
(Problem reported by Tim McBrayer for AIX 6.1.)
Fix zic configuration to avoid linkage failures on some platforms.
(Problems reported by Gilmore Davidson and Igor Ivanov.)
Work around MS-Windows nmake incompatibility with POSIX.
(Problem reported by Manuela Friedrich.)
Port mktime and strftime to debugging platforms where accessing
uninitialized data has undefined behavior (strftime problem
reported by Robert Elz).
Check more carefully for unlikely integer overflows, preferring
C23 <stdckdint.h> to overflow checking by hand, as the latter has
had obscure bugs.
Changes to build procedure
New Makefile rule check_mild that skips checking whether Link
lines are in the file 'backward'. (Inspired by a suggestion from
Stephen Colebourne.)
Here are links to the release files:
https://www.iana.org/time-zones/repository/releases/tzcode2022g.tar.gz
https://www.iana.org/time-zones/repository/releases/tzdata2022g.tar.gz
https://www.iana.org/time-zones/repository/releases/tzdb-2022g.tar.lz
The following convenience links are also available, although they may
point to the previous release until the relevant caches are refreshed:
https://www.iana.org/time-zones/repository/tzcode-latest.tar.gz
https://www.iana.org/time-zones/repository/tzdata-latest.tar.gz
https://www.iana.org/time-zones/repository/tzdb-latest.tar.lz
Links are also available via plain HTTP, and via FTP from
ftp://ftp.iana.org/tz/releases with the same basenames as above.
Each release file has a GPG signature, which can be retrieved by
appending ".asc" to the above URLs. Copies of these signatures are
appended to this message.
This release corresponds to commit
4e604e41115182c3ab1185bab4c888822511348e dated 2022-11-29 08:58:31 -0800
and tagged '2022g' in the development GitHub repository at
<https://github.com/eggert/tz>.
Here are the SHA-512 checksums for the release files:
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tzcode2022g.tar.gz
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tzdb-2022g.tar.lz
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1
0
The 2022f release of the tz code and data is available.
This release contains the following changes. The most urgent one is the
change for Chihuahua, Mexico which affects timestamps starting Sunday.
Briefly:
Mexico will no longer observe DST except near the US border.
Chihuahua moves to year-round -06 on 2022-10-30.
Fiji no longer observes DST.
Move links to 'backward'.
In vanguard form, GMT is now a Zone and Etc/GMT a link.
zic now supports links to links, and vanguard form uses this.
Simplify four Ontario zones.
Fix a Y2438 bug when reading TZif data.
Enable 64-bit time_t on 32-bit glibc platforms.
Omit large-file support when no longer needed.
In C code, use some C23 features if available.
Remove no-longer-needed workaround for Qt bug 53071.
Changes to future timestamps
Mexico will no longer observe DST after 2022, except for areas
near the US border that continue to observe US DST rules.
On 2022-10-30 at 02:00 the Mexican state of Chihuahua moves
from -07 (-06 with DST) to year-round -06, thus not changing
its clocks that day. The new law states that Chihuahua
near the US border no longer observes US DST.
(Thanks to gera for the heads-up about Chihuahua.)
Fiji will not observe DST in 2022/3. (Thanks to Shalvin Narayan.)
For now, assume DST is suspended indefinitely.
Changes to data
Move links to 'backward' to ease and simplify link maintenance.
This affects generated data only if you use 'make BACKWARD='.
GMT is now a Zone and Etc/GMT a link instead of vice versa,
as GMT is needed for leap second support whereas Etc/GMT is not.
However, this change exposes a bug in TZUpdater 2.3.2 so it is
present only in vanguard form for now.
Vanguard form now uses links to links, as zic now supports this.
Changes to past timestamps
Simplify four Ontario zones, as most of the post-1970 differences
seem to have been imaginary. (Problem reported by Chris Walton.)
Move America/Nipigon, America/Rainy_River, and America/Thunder_Bay
to 'backzone'; backward-compatibility links still work, albeit
with some different timestamps before November 2005.
Changes to code
zic now supports links to links regardless of input line order.
For example, if Australia/Sydney is a Zone, the lines
Link Australia/Canberra Australia/ACT
Link Australia/Sydney Australia/Canberra
now work correctly, even though the shell commands
ln Australia/Canberra Australia/ACT
ln Australia/Sydney Australia/Canberra
would fail because the first command attempts to use a link
Australia/Canberra that does not exist until after the second
command is executed. Previously, zic had unspecified behavior if
a Link line's target was another link, and zic often misbehaved if
a Link line's target was a later Link line.
Fix line number in zic's diagnostic for a link to a link.
Fix a bug that caused localtime to mishandle timestamps starting
in the year 2438 when reading data generated by 'zic -b fat' when
distant-future DST transitions occur at times given in standard
time or in UT, not the usual case of local time. This occurs when
the corresponding .zi Rule lines specify DST transitions with TO
columns of 'max' and AT columns that end in 's' or 'u'. The
number 2438 comes from the 32-bit limit in the year 2038, plus the
400-year Gregorian cycle. (Problem reported by Bradley White.)
On glibc 2.34 and later, which optionally supports 64-bit time_t
on platforms like x86 where time_t was traditionally 32 bits,
default time_t to 64 instead of 32 bits. This lets functions like
localtime support timestamps after the year 2038, and fixes
year-2038 problems in zic when accessing files dated after 2038.
To continue to limit time_t to 32 bits on these platforms, use
"make CFLAGS='-D_TIME_BITS=32'".
In C code, do not enable large-file support on platforms like AIX
and macOS that no longer need it now that tzcode does not use
off_t or related functions like 'stat'. Large-file support is
still enabled by default on GNU/Linux, as it is needed for 64-bit
time_t support.
In C code, prefer C23 keywords to pre-C23 macros for alignof,
bool, false, and true. Also, use the following C23 features if
available: __has_include, unreachable.
zic no longer works around Qt bug 53071, as the relevant Qt
releases have been out of support since 2019. This change affects
only fat TZif files, as thin files never had the workaround.
zdump no longer modifies the environ vector when compiled on
platforms lacking tm_zone or when compiled with -DUSE_LTZ=0.
This avoid undefined behavior on POSIX platforms.
Here are links to the release files:
https://www.iana.org/time-zones/repository/releases/tzcode2022f.tar.gz
https://www.iana.org/time-zones/repository/releases/tzdata2022f.tar.gz
https://www.iana.org/time-zones/repository/releases/tzdb-2022f.tar.lz
The following convenience links are also available, although they may
point to the previous release until the relevant caches are refreshed:
https://www.iana.org/time-zones/repository/tzcode-latest.tar.gz
https://www.iana.org/time-zones/repository/tzdata-latest.tar.gz
https://www.iana.org/time-zones/repository/tzdb-latest.tar.lz
Links are also available via plain HTTP, and via FTP from
ftp://ftp.iana.org/tz/releases with the same basenames as above.
Each release file has a GPG signature, which can be retrieved by
appending ".asc" to the above URLs. Copies of these signatures are
appended to this message.
This release corresponds to commit
d3dc2a9d65ce433555c994ce2cf84901b87d9357 dated 2022-10-28 18:04:57 -0700
and tagged '2022f' in the development GitHub repository at
<https://github.com/eggert/tz>.
Here are the SHA-512 checksums for the release files:
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tzcode2022f.tar.gz
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tzdata2022f.tar.gz
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tzdb-2022f.tar.lz
Here are the GPG digital signatures for the release files:
-----BEGIN PGP SIGNATURE-----
iQIzBAABCgAdFiEEfjeSqdis99YzvBWI7ZfpDmKqfjQFAmNcfQQACgkQ7ZfpDmKq
fjS19A//fGB4YH/GygGQkql4tlshrg7ykQIQCc3qDgBrj09JVeUfM/tAN5unx+lU
jBK/V5BK4K9bkrNCmxmhEdoCfdyKqusPLJSrI+ZwqqPXzNOt46dkzUxbRNYH2pvy
SZklxSpgJPa4h83I8C3afGOVJn6DYpnv8SKOV6jdOOk8C6aXMaDA6t16BxN1i1Ja
UKN9EQtC7xjtvtq7LtLcwo9GMy4pWoyb+CbDayG2wBq4ym3VFLxRbKupVFIDa0I7
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NdjQCpbYpoaUuo8nCf5clU4nzGEDb1sEkI6Mb8tGl2ZgG5gdC5a4P2i20vNmyIt/
uSquD7xmcBZ0CggijpFx0ndZ+0y7XSJNf7mCPaxc7vHCj5jAgQv8HLE6UXChCLeq
OazZOW7xEYTDyWQ9xt2HIY1RMVBeaEE5n9V3xyfBQpb/jYeIFm83nEP5X+KjlG0Z
0YGYrVieiwS1lzNTh+LXcXusMwe6B6wYt1G4pVUgasoFADUemfd9y0yzvpdkz6/2
+WvIAF4KbGwdVHteKFR+wq9UyaSFhTUL1f9f+DsYnSbApO4F7KFzDZ3tA9IVLxfy
WuOZkqjAtldzkQhoTiygF2cyGwgzWeT1WwNF6oowYYvisDf1o2E=
=JtyS
-----END PGP SIGNATURE-----
-----BEGIN PGP SIGNATURE-----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=E16s
-----END PGP SIGNATURE-----
-----BEGIN PGP SIGNATURE-----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=Eezp
-----END PGP SIGNATURE-----
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