timelocal(3) -- Linux man page
NAME
timegm, timelocal - inverses for gmtime and localtime
SYNOPSIS
#include <time.h>
time_t timelocal (struct tm *tm);
time_t timegm (struct tm *tm);
DESCRIPTION
The functions
timelocal()
and
timegm()
are the inverses to
localtime(3)
and
gmtime(3).
NOTES
These functions are GNU extensions.
The
timelocal()
function is equivalent to the POSIX standard function
mktime(3).
There is no reason to ever use it.
For a portable version of
timegm(),
set the
TZ
environment variable to UTC, call
mktime()
and restore the value of
TZ.
Something like
-
#include <time.h>
#include <stdlib.h>
time_t my_timegm (struct tm *tm) {
time_t ret;
char *tz;
tz = getenv("TZ");
setenv("TZ", "", 1);
tzset();
ret = mktime(tm);
if (tz)
setenv("TZ", tz, 1);
else
unsetenv("TZ");
tzset();
return ret;
}
SEE ALSO
gmtime(3),
localtime(3),
mktime(3),
tzset(3)
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