daylight
========

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

Gnulib module: ---

Portability problems fixed by Gnulib:

Portability problems not fixed by Gnulib:

  * This variable is missing on some platforms: FreeBSD 14.0, OpenBSD 3.8, IRIX 6.5.

  * The address of this variable is not a compile-time constant on some platforms: Cygwin, 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.