(given how complex a topic this is -- based on the discussion on the tz mailing list -- you might want to send a specific suggestion in the form of a patch...) On Mon, Feb 13, 2023 at 1:15 AM Almaz Mingaleev <mingaleev@xxxxxxxxxx> wrote: > > Friendly ping. > > > On Thu, 28 Jul 2022 at 09:16, Almaz Mingaleev <mingaleev@xxxxxxxxxx> wrote: > > > > Hi Michael, > > Current strftime specification in C language standard is not accurate. > > It tells that tm_isdst is enough to find out time zone's offset. But > > that's not true, for example Europe/Lisbon has changed [0] its > > standard offset from 00:00 to 01:00 and back to 00:00, so an exact > > date is needed to answer that. > > > > To get correct answer with the current glibc tm struct should either > > come from localtime or there should be a mktime call prior to > > strftime. You can find a repro example and discussion here [1]. Paul > > Eggert has proposed a fix to C standard [2]. > > > > Should man pages reflect that i.e. mention that there should be > > localtime/mktime calls for %z and %Z? > > > > Thanks, > > Almaz > > > > P.S. I am resending the email. My previous attempt was bounced back as > > it wasn't TEXT/PLAIN. > > > > [0] https://github.com/eggert/tz/blob/a249a0c64b2f87a24c7f1aab43056fb597c95b96/europe#L2400 > > [1] https://mm.icann.org/pipermail/tz/2022-July/031668.html > > [2] https://mm.icann.org/pipermail/tz/2022-July/031674.html
