The following packages have been upgraded in the Cygwin distribution:
* tzcode 2024a
* tzdata 2024a
The Time Zone Database (often called tz, tzdb, or zoneinfo) contains
data that represents the history of local time for many locations around
the world, and supports conversion of UTC time to local time at those
locations to allow display of those local times. It is updated
periodically to reflect changes made by political bodies to summer
daylight saving time rules, UTC offsets, and time zone boundaries.
The tzcode package provides the tzselect, zdump, and zic utilities.
For more information, see the project home page:
https://www.iana.org/time-zones
For more details on changes, see the announcement or below:
https://mm.icann.org/pipermail/tz-announce/2024-February/000081.html
2024a 2024-02-01
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.
- Palestine springs forward a week later than previously predicted in
2024 and 2025. 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.
- From 1947 through 1949, Toronto's transitions occurred at 02:00 not
00:00.
- 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.
- 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.
- strftime %s now uses tm_gmtoff if available.
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.
Changes to documentation
- The strftime man page documents which struct tm members affect which
conversion specs, and that tzset is called.
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