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timelocal (3)
  • timelocal (3) ( Русские man: Библиотечные вызовы )
  • >> timelocal (3) ( Linux man: Библиотечные вызовы )
  •  

    NAME

    timegm, timelocal - inverses of gmtime and localtime
     
    

    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 non-standard 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");
        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)  

    COLOPHON

    This page is part of release 3.14 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    CONFORMING TO
    NOTES
    SEE ALSO
    COLOPHON


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