gmtime
======

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

Gnulib module: ---

Portability problems fixed by Gnulib:

Portability problems not fixed by Gnulib:

  * On some platforms, this function yields incorrect values for timestamps before the year 1: MacOS X 10.5, Solaris 11.3.