:man| Alphabetical   Categories   About us 
 
TIMEGM (3) | C library functions | Unix Manual Pages | :man

NAME

timegm, timelocal - inverses for gmtime and localtime

CONTENTS

Synopsis
Description
Notes

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)


Share this page

     Follow us

Facebook Twitter Google+ LinkedIn


 
Created by Blin Media, 2008-2013