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NEWS
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News for the tz database
Unreleased, experimental changes
Changes affecting future time stamps
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.
(Thanks to Alexander Krivenyshev for the heads-up, and to Matt Johnson
and Stepan Golosunov for followup.)
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. (Thanks to Jean Antoine via
Steffen Thorsen.)
Palestine's spring-forward transition on 2016-03-26 is at 01:00, not 00:00.
(Thanks to Hannah Kreitem.) Guess future transitions will be March's last
Saturday at 01:00, not Harch's last Friday at 24:00.
Changes affecting past time stamps
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.)
Changes to code
tzselect's diagnostics and checking, and checktab.awk's checking,
have been improved. (Thanks to J William Piggott.)
tzcode now builds under MinGW. (Thanks to Ian Abbott and Esben Haabendal.)
tzselect now tests Julian-date TZ settings more accurately.
(Thanks to J William Piggott.)
Changes to commentary
Comments in zone tables have been improved. (Thanks to J William Piggott.)
tzselect again limits its menu comments so that menus fit on a
24x80 alphanumeric display.
A new web page tz-how-to.html. (Thanks to Bill Seymour.)
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.)
Release 2016a - 2016-01-26 23:28:02 -0800
Changes affecting future time stamps
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.
Changes affecting past and future time stamps
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.
Changes affecting past time stamps
Asia/Karachi's two transition times in 2002 were off by a minute.
(Thanks to Matt Johnson.)
Changes affecting build procedure
An installer can now combine leap seconds with use of the backzone file,
e.g., with 'make PACKRATDATA=backzone REDO=posix_right zones'.
The old 'make posix_packrat' rule is now marked as obsolescent.
(Thanks to Ian Abbott for an initial implementation.)
Changes affecting documentation and commentary
A new file LICENSE makes it easier to see that the code and data
are mostly public-domain. (Thanks to James Knight.) The three
non-public-domain files now use the current (3-clause) BSD license
instead of older versions of that license.
tz-link.htm mentions the BDE library (thanks to Andrew Paprocki),
CCTZ (thanks to Tim Parenti), TimeJones.com, and has a new section
on editing tz source files (with a mention of Sublime zoneinfo,
thanks to Gilmore Davidson).
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.)
Release 2015g - 2015-10-01 00:39:51 -0700
Changes affecting future time stamps
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.)
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.)
Changes affecting past time stamps
Norfolk observed DST from 1974-10-27 02:00 to 1975-03-02 02:00.
Changes affecting code
localtime no longer mishandles America/Anchorage after 2037.
(Thanks to Bradley White for reporting the bug.)
On hosts with signed 32-bit time_t, localtime no longer mishandles
Pacific/Fiji after 2038-01-16 14:00 UTC.
The localtime module allows the variables 'timezone', 'daylight',
and 'altzone' to be in common storage shared with other modules,
and declares them in case the system <time.h> does not.
(Problems reported by Kees Dekker.)
On platforms with tm_zone, strftime.c now assumes it is not NULL.
This simplifies the code and is consistent with zdump.c.
(Problem reported by Christos Zoulas.)
Changes affecting documentation
The tzfile man page now documents that transition times denote the
starts (not the ends) of the corresponding time periods.
(Ambiguity reported by Bill Seymour.)
Release 2015f - 2015-08-10 18:06:56 -0700
Changes affecting future time stamps
North Korea switches to +0830 on 2015-08-15. (Thanks to Steffen Thorsen.)
The abbreviation remains "KST". (Thanks to Robert Elz.)
Uruguay no longer observes DST. (Thanks to Steffen Thorsen
and Pablo Camargo.)
Changes affecting past and future time stamps
Moldova starts and ends DST at 00:00 UTC, not at 01:00 UTC.
(Thanks to Roman Tudos.)
Changes affecting data format and code
zic's '-y YEARISTYPE' option is no longer documented. The TYPE
field of a Rule line should now be '-'; the old values 'even',
'odd', 'uspres', 'nonpres', 'nonuspres' were already undocumented.
Although the implementation has not changed, these features do not
work in the default installation, they are not used in the data,
and they are now considered obsolescent.
zic now checks that two rules don't take effect at the same time.
(Thanks to Jon Skeet and Arthur David Olson.) Constraints on
simultaneity are now documented.
The two characters '%z' in a zone format now stand for the UTC
offset, e.g., '-07' for seven hours behind UTC and '+0530' for
five hours and thirty minutes ahead. This better supports time
zone abbreviations conforming to POSIX.1-2001 and later.
Changes affecting installed data files
Comments for America/Halifax and America/Glace_Bay have been improved.
(Thanks to Brian Inglis.)
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.)
Changes affecting code
zdump and zic no longer warn about valid time zone abbreviations
like '-05'.
Some Visual Studio 2013 warnings have been suppressed.
(Thanks to Kees Dekker.)
'date' no longer sets the time of day and its -a, -d, -n and -t
options have been removed. Long obsolescent, the implementation
of these features had porting problems. Builders no longer need
to configure HAVE_ADJTIME, HAVE_SETTIMEOFDAY, or HAVE_UTMPX_H.
(Thanks to Kees Dekker for pointing out the problem.)
Changes affecting documentation
The Theory file mentions naming issues earlier, as these seem to be
poorly publicized (thanks to Gilmore Davidson for reporting the problem).
tz-link.htm mentions Time Zone Database Parser (thanks to Howard Hinnant).
Mention that Herbert Samuel introduced the term "Summer Time".
Release 2015e - 2015-06-13 10:56:02 -0700
Changes affecting future time stamps
Morocco will suspend DST from 2015-06-14 03:00 through 2015-07-19 02:00,
not 06-13 and 07-18 as we had guessed. (Thanks to Milamber.)
Assume Cayman Islands will observe DST starting next year, using US rules.
Although it isn't guaranteed, it is the most likely.
Changes affecting data format
The file 'iso3166.tab' now uses UTF-8, so that its entries can better
spell the names of Åland Islands, Côte d'Ivoire, and Réunion.
Changes affecting code
When displaying data, tzselect converts it to the current locale's
encoding if the iconv command works. (Problem reported by random832.)
tzselect no longer mishandles Dominica, fixing a bug introduced
in Release 2014f. (Problem reported by Owen Leibman.)
zic -l no longer fails when compiled with -DTZDEFAULT=\"/etc/localtime\".
This fixes a bug introduced in Release 2014f.
(Problem reported by Leonardo Chiquitto.)
Release 2015d - 2015-04-24 08:09:46 -0700
Changes affecting future time stamps
Egypt will not observe DST in 2015 and will consider canceling it
permanently. For now, assume no DST indefinitely.
(Thanks to Ahmed Nazmy and Tim Parenti.)
Changes affecting past time stamps
America/Whitehorse switched from UTC-9 to UTC-8 on 1967-05-28, not
1966-07-01. Also, Yukon's time zone history is documented better.
(Thanks to Brian Inglis and Dennis Ferguson.)
Change affecting past and future time zone abbreviations
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.
Changes affecting code
zic has some minor performance improvements.
Release 2015c - 2015-04-11 08:55:55 -0700
Changes affecting future time stamps
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. (Thanks to Steffen Thorsen.)
Changes affecting past time stamps
The following changes affect some pre-1991 Chile-related time stamps
in America/Santiago, Antarctica/Palmer, and Pacific/Easter.
The 1910 transition was January 10, not January 1.
The 1918 transition was September 10, not September 1.
The UTC-4 time observed from 1932 to 1942 is now considered to be
standard time, not year-round DST.
Santiago observed DST (UTC-3) from 1946-07-15 through 1946-08-31,
then reverted to standard time, then switched its time zone to
UTC-5 on 1947-04-01.
Assume transitions before 1968 were at 00:00, since we have no data
saying otherwise.
The spring 1988 transition was 1988-10-09, not 1988-10-02.
The fall 1990 transition was 1990-03-11, not 1990-03-18.
Assume no UTC offset change for Pacific/Easter on 1890-01-01,
and omit all transitions on Pacific/Easter from 1942 through 1946
since we have no data suggesting that they existed.
One more zone has been turned into a link, as it differed
from an existing zone only for older time stamps. As usual,
this change affects UTC offsets in pre-1970 time stamps only.
The zone's old contents have been moved to the 'backzone' file.
The affected zone is America/Montreal.
Changes affecting commentary
Mention the TZUpdater tool.
Mention "The Time Now". (Thanks to Brandon Ramsey.)
Release 2015b - 2015-03-19 23:28:11 -0700
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.
Their old contents have been moved to the 'backzone' file.
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 code
Fix integer overflow bug in reference 'mktime' implementation.
(Problem reported by Jörg Richter.)
Allow -Dtime_tz=time_t compilations, and allow -Dtime_tz=... libraries
to be used in the same executable as standard-library time_t functions.
(Problems reported by Bradley White.)
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.
Release 2015a - 2015-01-29 22:35:20 -0800
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.
Their old contents have been moved to the 'backzone' file.
The affected zones are: Asia/Aden, Asia/Bahrain, Asia/Kuwait,
and Asia/Muscat.
Changes affecting code
tzalloc now scrubs time zone abbreviations compatibly with the way
that tzset always has, by replacing invalid bytes with '_' and by
shortening too-long abbreviations.
tzselect ports to POSIX awk implementations, no longer mishandles
POSIX TZ settings when GNU awk is used, and reports POSIX TZ
settings to the user. (Thanks to Stefan Kuhn.)
Changes affecting build procedure
'make check' now checks for links to links in the data.
One such link (for Africa/Asmera) has been fixed.
(Thanks to Stephen Colebourne for pointing out the problem.)
Changes affecting commentary
The leapseconds file commentary now mentions the expiration date.
(Problem reported by Martin Burnicki.)
Update Mexican Library of Congress URL.
Release 2014j - 2014-11-10 17:37:11 -0800
Changes affecting current and future time stamps
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. (Thanks to Chris Walton.)
Changes affecting past time stamps
Many pre-1989 time stamps have been corrected for Asia/Seoul and
Asia/Pyongyang, based on sources for the Korean-language Wikipedia
entry for time in Korea. (Thanks to Sanghyuk Jung.) Also, no
longer guess that Pyongyang mimicked Seoul time after World War II,
as this is politically implausible.
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.
Their old contents have been moved to the 'backzone' file.
The affected zones are: Africa/Addis_Ababa, Africa/Asmara,
Africa/Dar_es_Salaam, Africa/Djibouti, Africa/Kampala,
Africa/Mogadishu, Indian/Antananarivo, Indian/Comoro, and
Indian/Mayotte.
Changes affecting commentary
The commentary is less enthusiastic about Shanks as a source,
and is more careful to distinguish UT from UTC.
Release 2014i - 2014-10-21 22:04:57 -0700
Changes affecting future time stamps
Pacific/Fiji will observe DST from 2014-11-02 02:00 to 2015-01-18 03:00.
(Thanks to Ken Rylander for the heads-up.) Guess that future
years will use a similar pattern.
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.
(Thanks to Kiley Walbom for the heads-up.)
Changes affecting time zone abbreviations
Since Belarus is not changing its clocks even though Moscow is,
the time zone abbreviation in Europe/Minsk is changing from FET
to its more-traditional value MSK on 2014-10-26 at 01:00.
(Thanks to Alexander Bokovoy for the heads-up about Belarus.)
The new abbreviation IDT stands for the pre-1976 use of UT+8 in
Indochina, to distinguish it better from ICT (UT+7).
Changes affecting past time stamps
Many time stamps have been corrected for Asia/Ho_Chi_Minh before 1976
(thanks to Trần Ngọc Quân for an indirect pointer to Trần Tiến Bình's
authoritative book). Asia/Ho_Chi_Minh has been added to
zone1970.tab, to give tzselect users in Vietnam two choices,
since north and south Vietnam disagreed after our 1970 cutoff.
Asia/Phnom_Penh and Asia/Vientiane have been turned into links, as
they differed from existing zones only for older time stamps. As
usual, these changes affect pre-1970 time stamps only. Their old
contents have been moved to the 'backzone' file.
Changes affecting code
The time-related library functions now set errno on failure, and
some crashes in the new tzalloc-related library functions have
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,
the tz library's localtime and mktime functions now set the extern
variable timezone to a value appropriate for that time stamp; 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
than having undefined behavior.
Some bugs associated with the new 2014g functions have been fixed.
This includes a bug that largely incapacitated the new functions
time2posix_z and posix2time_z. (Thanks to Christos Zoulas.)
It also includes some uses of uninitialized variables after tzalloc.
The new code uses the standard type 'ssize_t', which the Makefile
now gives porting advice about.
Changes affecting commentary
Updated URLs for NRC Canada (thanks to Matt Johnson and Brian Inglis).
Release 2014h - 2014-09-25 18:59:03 -0700
Changes affecting past time stamps
America/Jamaica's 1974 spring-forward transition was Jan. 6, not Apr. 28.
Shanks says Asia/Novokuznetsk switched from LMT (not "NMT") on 1924-05-01,
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.
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,
Africa/Lusaka, Africa/Maseru, and Africa/Mbabane.
Changes affecting code
zdump -V and -v now output gmtoff= values on all platforms,
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
on platforms not defining TM_ZONE, fixing a 2014g regression.
(Thanks to Tim Parenti for reporting the problem.)
The tz library no longer sets tzname if localtime or mktime fails.
zdump -c no longer mishandles transitions near year boundaries.
(Thanks to Tim Parenti for reporting the problem.)
An access to uninitalized data has been fixed.
(Thanks to Jörg Richter for reporting the problem.)
When THREAD_SAFE is defined, the code ports to the C11 memory model.
A memory leak has been fixed if ALL_STATE and THREAD_SAFE are defined
and two threads race to initialize data used by gmtime-like functions.
(Thanks to Andy Heninger for reporting the problems.)
Changes affecting build procedure
'make check' now checks better for properly-sorted data.
Changes affecting documentation and commentary
zdump's gmtoff=N output is now documented, and its isdst=D output
is now documented to possibly output D values other than 0 or 1.
zdump -c's treatment of years is now documented to use the
Gregorian calendar and Universal Time without leap seconds,
and its behavior at cutoff boundaries is now documented better.
(Thanks to Arthur David Olson and Tim Parenti for reporting the problems.)
Programs are now documented to use the proleptic Gregorian calendar.
(Thanks to Alan Barrett for the suggestion.)
Fractional-second GMT offsets have been documented for civil time
in 19th-century Chennai, Jakarta, and New York.
Release 2014g - 2014-08-28 12:31:23 -0700
Changes affecting future time stamps
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.
[As noted in 2014j, this switch was later delayed.]
Changes affecting past time stamps
Time in Russia or the USSR before 1926 or so has been corrected by
a few seconds in the following zones: Asia/Irkutsk,
Asia/Krasnoyarsk, Asia/Omsk, Asia/Samarkand, Asia/Tbilisi,
Asia/Vladivostok, Asia/Yakutsk, Europe/Riga, Europe/Samara. For
Asia/Yekaterinburg the correction is a few minutes. (Thanks to
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,
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.)
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
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.
(Thanks to Lester Caine for the high-quality Jersey, Guernsey, and
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.
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,
Africa/Malabo, Africa/Niamey, and Africa/Porto-Novo.
Changes affecting code
Unless NETBSD_INSPIRED is defined to 0, the tz library now
supplies functions for creating and using objects that represent
time zones. The new functions are tzalloc, tzfree, localtime_rz,
mktime_z, and (if STD_INSPIRED is also defined) posix2time_z and
time2posix_z. They are intended for performance: for example,
localtime_rz (unlike localtime_r) is trivially thread-safe without
locking. (Thanks to Christos Zoulas for proposing NetBSD-inspired
functions, and to Alan Barrett and Jonathan Lennox for helping to
debug the change.)
zdump now builds with the tz library unless USE_LTZ is defined to 0,
This lets zdump use tz features even if the system library lacks them.
To build zdump with the system library, use 'make CFLAGS=-DUSE_LTZ=0
TZDOBJS=zdump.o CHECK_TIME_T_ALTERNATIVES='.
zdump now uses localtime_rz if available, as it's significantly faster,
and it can help zdump better diagnose invalid time zone names.
Define HAVE_LOCALTIME_RZ to 0 to suppress this. HAVE_LOCALTIME_RZ
defaults to 1 if NETBSD_INSPIRED && USE_LTZ. When localtime_rz is
not available, zdump now uses localtime_r and tzset if available,
as this is a bit cleaner and faster than plain localtime. Compile
with -DHAVE_LOCALTIME_R=0 and/or -DHAVE_TZSET=0 if your system
lacks these two functions.
If THREAD_SAFE is defined to 1, the tz library is now thread-safe.
Although not needed for tz's own applications, which are single-threaded,
this supports POSIX better if the tz library is used in multithreaded apps.
Some crashes have been fixed when zdump or the tz library is given
invalid or outlandish input.
The tz library no longer mishandles leap seconds on platforms with
unsigned time_t in time zones that lack ordinary transitions after 1970.
The tz code now attempts to infer TM_GMTOFF and TM_ZONE if not
already defined, to make it easier to configure on common platforms.
Define NO_TM_GMTOFF and NO_TM_ZONE to suppress this.
Unless the new macro UNINIT_TRAP is defined to 1, the tz code now
assumes that reading uninitialized memory yields garbage values
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
transitions where tm_isdst does not change.
If HAVE_STRFTIME_L is defined to 1, the tz library now defines
strftime_l for compatibility with recent versions of POSIX.
Only the C locale is supported, though. HAVE_STRFTIME_L defaults
to 1 on recent POSIX versions, and to 0 otherwise.
tzselect -c now uses a hybrid distance measure that works better
in Africa. (Thanks to Alan Barrett for noting the problem.)
The C source code now ports to NetBSD when GCC_DEBUG_FLAGS is used,
or when time_tz is defined.
When HAVE_UTMPX_H is set the 'date' command now builds on systems
whose <utmpx.h> file does not define WTMPX_FILE, and when setting
the date it updates the wtmpx file if _PATH_WTMPX is defined.
This affects GNU/Linux and similar systems.
For easier maintenance later, some C code has been simplified,
some lint has been removed, and the code has been tweaked so that
plain 'make' is more likely to work.
The C type 'bool' is now used for boolean values, instead of 'int'.
The long-obsolete LOCALE_HOME code has been removed.
The long-obsolete 'gtime' function has been removed.
Changes affecting build procedure
'zdump' no longer links in ialloc.o, as it's not needed.
'make check_time_t_alternatives' no longer assumes GNU diff.
Changes affecting distribution tarballs
The files checktab.awk and zoneinfo2tdf.pl are now distributed in
the tzdata tarball instead of the tzcode tarball, since they help
maintain the data. The NEWS and Theory files are now also
distributed in the tzdata tarball, as they're relevant for data.
(Thanks to Alan Barrett for pointing this out.) Also, the
leapseconds.awk file is no longer distributed in the tzcode
tarball, since it belongs in the tzdata tarball (where 2014f
inadvertently also distributed it).
Changes affecting documentation and commentary
A new file CONTRIBUTING is distributed. (Thanks to Tim Parenti for
suggesting a CONTRIBUTING file, and to Tony Finch and Walter Harms
for debugging it.)
The man pages have been updated to use function prototypes,
to document thread-safe variants like localtime_r, and to document
the NetBSD-inspired functions tzalloc, tzfree, localtime_rz, and
mktime_z.
The fields in Link lines have been renamed to be more descriptive
and more like the parameters of 'ln'. LINK-FROM has become TARGET,
and LINK-TO has become LINK-NAME.
tz-link.htm mentions the IETF's tzdist working group; Windows
Runtime etc. (thanks to Matt Johnson); and HP-UX's tztab.
Some broken URLs have been fixed in the commentary. (Thanks to
Lester Caine.)
Commentary about Philippines DST has been updated, and commentary
on pre-1970 time in India has been added.
Release 2014f - 2014-08-05 17:42:36 -0700
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.)
There are a few exceptions: Magadan Oblast (Asia/Magadan) and Zabaykalsky
Krai are subtracting two hours; conversely, Chukotka Autonomous Okrug
(Asia/Anadyr), Kamchatka Krai (Asia/Kamchatka), Kemerovo Oblast
(Asia/Novokuznetsk), and the Samara Oblast and the Udmurt Republic
(Europe/Samara) are not changing their clocks. The changed zones are
Europe/Kaliningrad, Europe/Moscow, Europe/Simferopol, Europe/Volgograd,
Asia/Yekaterinburg, Asia/Omsk, Asia/Novosibirsk, Asia/Krasnoyarsk,
Asia/Irkutsk, Asia/Yakutsk, Asia/Vladivostok, Asia/Khandyga,
Asia/Sakhalin, and Asia/Ust-Nera; Asia/Magadan will have two hours
subtracted; and Asia/Novokuznetsk's time zone abbreviation is affected,
but not its UTC offset. Two zones are added: Asia/Chita (split
from Asia/Yakutsk, and also with two hours subtracted) and
Asia/Srednekolymsk (split from Asia/Magadan, but with only one hour
subtracted). (Thanks to Tim Parenti for much of the above.)
Changes affecting time zone abbreviations
Australian eastern time zone abbreviations are now AEST/AEDT not EST,
and similarly for the other Australian zones. That is, for eastern
standard and daylight saving time the abbreviations are AEST and AEDT
instead of the former EST for both; similarly, ACST/ACDT, ACWST/ACWDT,
and AWST/AWDT are now used instead of the former CST, CWST, and WST.
This change does not affect UTC offsets, only time zone abbreviations.
(Thanks to Rich Tibbett and many others.)
Asia/Novokuznetsk shifts from NOVT to KRAT (remaining on UTC+7)
effective 2014-10-26 at 02:00 local time.
The time zone abbreviation for Xinjiang Time (observed in Ürümqi)
has been changed from URUT to XJT. (Thanks to Luther Ma.)
Prefer MSK/MSD for Moscow time in Russia, even in other cities.
Similarly, prefer EET/EEST for eastern European time in Russia.
Change time zone abbreviations in (western) Samoa to use "ST" and
"DT" suffixes, as this is more likely to match common practice.
Prefix "W" to (western) Samoa time when its standard-time offset
disagrees with that of American Samoa.
America/Metlakatla now uses PST, not MeST, to abbreviate its time zone.
Time zone abbreviations have been updated for Japan's two time
zones used 1896-1937. JWST now stands for Western Standard
Time, and JCST for Central Standard Time (formerly this was CJT).
These abbreviations are now used for time in Korea, Taiwan,
and Sakhalin while controlled by Japan.
Changes affecting past time stamps
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
1980 transition to UTC+8 has been removed, so that it is now at
UTC+6 and not UTC+8. (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
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,
Africa/Nouakchott, Africa/Ouagadougou, Africa/Sao_Tome, and
Atlantic/St_Helena. This also affects the backwards-compatibility
link Africa/Timbuktu. (Thanks to Alan Barrett, Stephen Colebourne,
Tim Parenti, and David Patte for reporting problems in earlier
versions of this change.)
Asia/Shanghai's pre-standard-time UT offset has been changed from
8:05:57 to 8:05:43, the location of Xujiahui Observatory. Its
transition to standard time has been changed from 1928 to 1901.
Asia/Taipei switched to JWST on 1896-01-01, then to JST on 1937-10-01,
then to CST on 1945-09-21 at 01:00, and did not observe DST in 1945.
In 1946 it observed DST from 05-15 through 09-30; in 1947
from 04-15 through 10-31; and in 1979 from 07-01 through 09-30.
(Thanks to Yu-Cheng Chuang.)
Asia/Riyadh's transition to standard time is now 1947-03-14, not 1950.
Europe/Helsinki's 1942 fall-back transition was 10-04 at 01:00, not
10-03 at 00:00. (Thanks to Konstantin Hyppönen.)
Pacific/Pago_Pago has been changed from UTC-11:30 to UTC-11 for the period
from 1911 to 1950.
Pacific/Chatham has been changed to New Zealand standard time plus
45 minutes for the period before 1957, reflecting a 1956 remark in
the New Zealand parliament.
Europe/Budapest has several pre-1946 corrections: in 1918 the transition
out of DST was on 09-16, not 09-29; in 1919 it was on 11-24, not 09-15; in
1945 it was on 11-01, not 11-03; in 1941 the transition to DST was 04-08
not 04-06 at 02:00; and there was no DST in 1920.
Africa/Accra is now assumed to have observed DST from 1920 through 1935.
Time in Russia before 1927 or so has been corrected by a few seconds in
the following zones: Europe/Moscow, Asia/Irkutsk, Asia/Tbilisi,
Asia/Tashkent, Asia/Vladivostok, Asia/Yekaterinburg, Europe/Helsinki, and
Europe/Riga. Also, Moscow's location has been changed to its Kilometer 0
point. (Thanks to Vladimir Karpinsky for the Moscow changes.)
Changes affecting data format
A new file 'zone1970.tab' supersedes 'zone.tab' in the installed data.
The new file's extended format allows multiple country codes per zone.
The older file is still installed but is deprecated; its format is
not changing and it will still be distributed for a while, but new
applications should use the new file.
The new file format simplifies maintenance of obscure locations.
To test this, it adds coverage for the Crozet Islands and the
Scattered Islands. (Thanks to Tobias Conradi and Antoine Leca.)
The file 'iso3166.tab' is planned to switch from ASCII to UTF-8.
It is still ASCII now, but commentary about the switch has been added.
The new file 'zone1970.tab' already uses UTF-8.
Changes affecting code
'localtime', 'mktime', etc. now use much less stack space if ALL_STATE
is defined. (Thanks to Elliott Hughes for reporting the problem.)
'zic' no longer mishandles input when ignoring case in locales that
are not compatible with English, e.g., unibyte Turkish locales when
compiled with HAVE_GETTEXT.
Error diagnostics of 'zic' and 'yearistype' have been reworded so that
they no longer use ASCII '-' as if it were a dash.
'zic' now rejects output file names that contain '.' or '..' components.
(Thanks to Tim Parenti for reporting the problem.)
'zic -v' now warns about output file names that do not follow
POSIX rules, or that contain a digit or '.'. (Thanks to Arthur
David Olson for starting the ball rolling on this.)
Some lint has been removed when using GCC_DEBUG_FLAGS with GCC 4.9.0.
Changes affecting build procedure
'zic' no longer links in localtime.o and asctime.o, as they're not needed.
(Thanks to John Cochran.)
Changes affecting documentation and commentary
The 'Theory' file documents legacy names, the longstanding
exceptions to the POSIX-inspired file name rules.
The 'zic' documentation clarifies the role of time types when
interpreting dates. (Thanks to Arthur David Olson.)
Documentation and commentary now prefer UTF-8 to US-ASCII,
allowing the use of proper accents in foreign words and names.
Code and data have not changed because of this. (Thanks to
Garrett Wollman, Ian Abbott, and Guy Harris for helping to debug
this.)
Non-HTML documentation and commentary now use plain-text URLs instead of
HTML insertions, and are more consistent about bracketing URLs when they
are not already surrounded by white space. (Thanks to suggestions by
Steffen Nurpmeso.)
There is new commentary about Xujiahui Observatory, the five time-zone
project in China from 1918 to 1949, timekeeping in Japanese-occupied
Shanghai, and Tibet Time in the 1950s. The sharp-eyed can spot the
warlord Jin Shuren in the data.
Commentary about the coverage of each Russian zone has been standardized.
(Thanks to Tim Parenti).
There is new commentary about contemporary timekeeping in Ethiopia.
Obsolete comments about a 2007 proposal for DST in Kuwait has been removed.
There is new commentary about time in Poland in 1919.
Proper credit has been given to DST inventor George Vernon Hudson.
Commentary about time in Metlakatla, AK and Resolute, NU has been
improved, with a new source for the former.
In zone.tab, Pacific/Easter no longer mentions Salas y Gómez, as it
is uninhabited.
Commentary about permanent Antarctic bases has been updated.
Several typos have been corrected. (Thanks to Tim Parenti for
contributing some of these fixes.)
tz-link.htm now mentions the JavaScript libraries Moment Timezone,
TimezoneJS.Date, Walltime-js, and Timezone. (Thanks to a heads-up
from Matt Johnson.) Also, it mentions the Go 'latlong' package.
(Thanks to a heads-up from Dirkjan Ochtman.)
The files usno1988, usno1989, usno1989a, usno1995, usno1997, and usno1998
have been removed. These obsolescent US Naval Observatory entries were no
longer helpful for maintenance. (Thanks to Tim Parenti for the suggestion.)
Release 2014e - 2014-06-12 21:53:52 -0700
Changes affecting near-future time stamps
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
switch to standard time at 24:00 the last Thursday before Ramadan, and
back to DST at 00:00 the first Friday after Ramadan.
Similarly, Morocco's are June 28 at 03:00 and August 2 at 02:00. (Thanks
to Milamber Space Network.) Guess that from 2015 on Morocco will
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
The abbreviation "MSM" (Moscow Midsummer Time) is now used instead of
"MSD" for Moscow's double daylight time in summer 1921. Also, a typo
"VLASST" has been repaired to be "VLAST" for Vladivostok summer time
in 1991. (Thanks to Hank W. for reporting the problems.)
Changes affecting commentary
tz-link.htm now cites RFC 7265 for jCal, mentions PTP and the
draft CalDAV extension, updates URLs for TSP, TZInfo, IATA, and
removes stale pointers to World Time Explorer and WORLDTIME.
Release 2014d - 2014-05-27 21:34:40 -0700
Changes affecting code
zic no longer generates files containing time stamps 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
Arthur David Olson and James Cloos for suggesting improvements to the fix.)
Changes affecting documentation
tz-link.htm now mentions GNOME.
Release 2014c - 2014-05-13 07:44:13 -0700
Changes affecting near-future time stamps