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.
Three data packages are available: base 'tzdata' is always installed;
optional 'tzdata-right' provides TAI-10s time in the 'right' subtree;
and optional 'tzdata-posix' provides the same zones and times as base
data in the 'posix' subtree, as an explicit distinction from 'right'.
The tzcode package provides the tzselect, zdump, and zic utilities.
For more information, see the project home page:
https://www.iana.org/time-zones
The following packages have been upgraded in the Cygwin distribution:
- tzdata 2025b base zones tree
- tzdata-posix 2025b posix zones subtree
- tzdata-right 2025b TAI-10s right zones subtree
- tzcode 2025b utilities
For more details on changes, see the announcement or below:
https://lists.iana.org/hyperkitty/list/[email protected]/2025/3/
2025-03-22 2025b
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. 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.
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.
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