Hi,

can you send a reproducer? I have written the attached program, and
cannot see the issue. I have tried both the zoneinfo file and the POSIX
TZ.


$ TZ=Europe/Prague ./foo 2024 3 31 1 58 00
before: 2024-03-31 01:58:00 CET
after: 2024-03-31 03:00:00 CEST
$ TZ=CET-1CEST,M3.5.0,M10.5.0/3 ./foo 2024 3 31 1 58 00
before: 2024-03-31 01:58:00 CET
after: 2024-03-31 03:00:00 CEST

What are you doing different?

Ciao,
Markus