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Since tzset() itself pretends to succeed (it just sets timezone = 0 for
now), it seems unwise to leave tzname uninitialized. Since Serenity
already assumes UTC pretty much everywhere time is used, let's continue
that trend here. Quoting POSIX:
https://pubs.opengroup.org/onlinepubs/009695399/functions/tzset.html
The tzset() function shall use the value of the environment variable
TZ to set time conversion information used by ctime(), localtime(),
mktime(), and strftime(). If TZ is absent from the environment,
implementation-defined default timezone information shall be used.
So we still don't care about TZ at all, but the program doesn't need to
know! :^)
This matches what musl libc ("UTC") and glibc ("GMT") do, see:
- https://sourceware.org/git/?p=glibc.git;a=blob;f=time/tzset.c
- https://git.musl-libc.org/cgit/musl/tree/src/time/__tz.c
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