@node mktime
@subsection @code{mktime}
@findex mktime

POSIX specification:@* @url{https://pubs.opengroup.org/onlinepubs/9799919799/functions/mktime.html}

Gnulib module: mktime
@mindex mktime

Portability problems fixed by Gnulib:
@itemize
@item
On native Windows platforms (mingw, MSVC), this function works incorrectly
when the environment variable @env{TZ} has been set by Cygwin.
@item
@code{mktime} may go into an endless loop on some platforms.
@item
@code{mktime} may occasionally return wrong results on some platforms.
@end itemize

Portability problems not fixed by Gnulib:
@itemize
@item
On some platforms, this function yields incorrect values for
timestamps before the year 1:
MacOS X 10.5, Solaris 11.3.
@item
Native Windows platforms (mingw, MSVC) support only a subset of time
zones supported by GNU or specified by POSIX@.  @xref{tzset}.
@end itemize
