wcsftime
========

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

Gnulib module: wcsftime

Portability problems fixed by Gnulib:

  * On native Windows platforms (mingw, MSVC), this function works incorrectly when the environment variable TZ has been set by Cygwin.

Portability problems not fixed by Gnulib:

  * This function is missing on some platforms: OpenBSD 3.8, Minix 3.1.8, Cygwin 1.5.x.

  * On Windows and 32-bit AIX platforms, wchar_t is a 16-bit type and therefore cannot accommodate all Unicode characters.

  * Native Windows platforms (mingw, MSVC) support only a subset of time zones specified by POSIX.  See tzset.