tzdb 2025b: 2 time zone changes

Read the 2 time zone changes in IANA tzdb 2025b, released on March 22, 2025, with links to affected countries and time zones.

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Published: · Automatically generated from source data.

Published on Time Dozen:

Source: IANA

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.)
Other notes in this release (code, build procedure, documentation)

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.)