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10.1237 tzname

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

Gnulib module: tzname

Portability problems fixed by Gnulib:

• This variable is called _tzname on some platforms: mingw with -DNO_OLDNAMES, MSVC.

Portability problems not fixed by Gnulib:

• This variable’s contents are unreliable if you use a geographical TZ setting like TZ="America/Los_Angeles".
• The address of this variable is not a compile-time constant on some platforms: Cygwin, mingw, MSVC.
• Native Windows platforms (mingw, MSVC) support only a subset of time zones supported by GNU or specified by POSIX. See tzset.

This variable is vestigial: it is not needed and does not suffice in general. It is planned to be removed from a future version of POSIX. A more portable way of getting the time zone abbreviation is to use strftime with the %Z format. See strftime.