Timezone-aware datetime - zdt

FObersteiner · December 11, 2025, 5:02pm

2 years and still here (again) - still nice to track Zig’s progress. `zdt` now with the latest IANA tzdata release 2025c - no rule changes as far as I can see, just comments and code updates (which is not used by zdt).

zdt for Zig 0.15 / stable
[zdt for Zig master]( 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/> <title>archive.org. ) - experimental, there are some work-arounds.

FObersteiner · March 3, 2026, 5:10pm

New IANA timezone db release 2026a

zdt for Zig master: https://codeberg.org/FObersteiner/zdt/releases/tag/v0.9.1-zig_master
zdt for Zig 0.15: https://codeberg.org/FObersteiner/zdt/releases/tag/v0.8.3-zig_0.15

Next timezone db release probably around the corner since British Columbia / CA seems to have decided to stay on DST after the transition in March.

FObersteiner · April 23, 2026, 3:29pm

Next IANA tzdb iteration, 2026b - in zdt 0.9.3, https://codeberg.org/FObersteiner/zdt/releases/tag/v0.9.3

This version 0.9.3 should also be fully compatible with zig-0.16-stable (no guarantee for Windows). A zig-0.17-master version will have to wait for a while, too involved in family matters at the moment

Slice · April 24, 2026, 3:19am

Very cool. I have a friend working on something similar with date (different application). But man, you guys attacked impressive sh: DST gap rejection and POSIX TZ support pretty impressive in your last version. I’m going to update to v0.9.3 now. Nice work!!

FObersteiner · July 9, 2026, 6:02am

IANA tzdb 2026c is out, Canada keeps pushing it

Just tagged v0.9.4 for Zig 0.16 and v0.10.0-dev for Zig master.

If a system-independent timezone database should be part of Zig std at some point, you’ll need and automated update process