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    The following form allows you to view linux man pages.

    Command:

    timegm

    
    
    

    SYNOPSIS

           #include <time.h>
    
           time_t timelocal(struct tm *tm);
    
           time_t timegm(struct tm *tm);
    
       Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
    
           timelocal(), timegm(): _BSD_SOURCE || _SVID_SOURCE
    
    
    

    DESCRIPTION

           The functions timelocal() and timegm() are the inverses of localtime(3)
           and gmtime(3).
    
    
    

    CONFORMING TO

           These functions are nonstandard GNU extensions that are also present on
           the BSDs.  Avoid their use; see NOTES.
    
    
    

    NOTES

           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(3) 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");
                   if (tz)
                       tz = strdup(tz);
                   setenv("TZ", "", 1);
                   tzset();
                   ret = mktime(tm);
                   if (tz) {
                       setenv("TZ", tz, 1);
                       free(tz);
                   } else
                       unsetenv("TZ");
                   tzset();
                   return ret;
               }
    
    
    

    SEE ALSO

           gmtime(3), localtime(3), mktime(3), tzset(3)
    
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