[tz] Buggy %z behaviour in strftime

[Andreas Schwab]

On Jul 18 2022, Almaz Mingaleev via tz wrote:

> Attached code prints "+0000 America/Los_Angeles" both with glibc and with
> linked ToT strftime implementation.
> On MacOs it prints "-0800 America/Los_Angeles".
> Is it a known issue?
> #include <time.h>
> #include <stdio.h>
> #include <stdlib.h>
>  
> int main() {
>   struct tm tm = {.tm_mday = 12, .tm_mon = 3, .tm_year = 2022 - 1900, .tm_zone = "America/Los_Angeles"};

You are not setting tm_gmtoff, thus it remains at zero.  MacOS probably
doesn't have tm_gmtoff.

-- 
Andreas Schwab, SUSE Labs, schwab at suse.de
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