table of contents
other versions
- wheezy 3.44-1
- jessie 3.74-1
- jessie-backports 4.10-2~bpo8+1
- testing 4.10-2
- unstable 4.10-2
TIMEGM(3) | Linux Programmer's Manual | TIMEGM(3) |
NAME¶
timegm, timelocal - inverses of gmtime and localtimeSYNOPSIS¶
#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)):
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"); 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 3.44 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/.2007-07-26 | GNU |