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10.1159 timezone

POSIX specification:
https://pubs.opengroup.org/onlinepubs/9699919799/functions/timezone.html

Gnulib module: —

Portability problems fixed by Gnulib:

Portability problems not fixed by Gnulib:

• This variable is missing on some platforms: IRIX 6.5, mingw.
• The address of this variable is not a compile-time constant on some platforms: mingw.
• Native Windows platforms (mingw, MSVC) support only a subset of time zones supported by GNU or specified by POSIX. See tzset.

A more portable way of getting the UTC offset is to use strftime with the %z format. See strftime.