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@node mktime
@section @code{mktime}
@findex mktime
POSIX specification:@* @url{https://pubs.opengroup.org/onlinepubs/9699919799/functions/mktime.html}
Gnulib module: mktime
Portability problems fixed by Gnulib:
@itemize
@item
On native Windows platforms (mingw, MSVC), this function works incorrectly
when the environment variable @code{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
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