localtime_r (GNU Gnulib)

Gnulib module: time_r

Portability problems fixed by Gnulib:

This function is missing on some platforms: mingw, MSVC 14.
This function is not declared unless _REENTRANT is defined, on some platforms: HP-UX 11.

Portability problems not fixed by Gnulib:

On some platforms, this function loops forever for values near extrema (such as the year -2**31): Mac OS X 10.6. You can use the time_rz module to work around the problem.
On some platforms, this function returns nonsense values for unsupported arguments (like 2^56), rather than failing: FreeBSD 10.
On some platforms, this function yields incorrect values for timestamps before the year 1: MacOS X 10.5, Solaris 11.3.