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'.
For more information, see the project home page:
https://www.iana.org/time-zones
The following test packages have been uploaded to the Cygwin distribution:
- tzdata 2025b-2 base zones tree
- tzdata-posix 2025b-2 posix zones subtree
- tzdata-right 2025b-2 TAI-10s right zones subtree
The base tzdata test package now installs
/usr/share/zoneinfo/leap-seconds.list
with a symbolic link to the standard location
/etc/leap-seconds.list.
This was requested to allow testing addition of newlib CLOCK_TAI support.
Otherwise the packages should be the same as the current stable release.
If no issues arise, this file will be installed with the next official
stable release of time zone data updates, when that is available.
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