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NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | ATTRIBUTES | STANDARDS | HISTORY | SEE ALSO | COLOPHON |
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timegm(3) Library Functions Manual timegm(3)
timegm, timelocal - inverses of gmtime and localtime
Standard C library (libc, -lc)
#include <time.h>
[[deprecated]] 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():
Since glibc 2.19:
_DEFAULT_SOURCE
glibc 2.19 and earlier:
_BSD_SOURCE || _SVID_SOURCE
The functions timelocal() and timegm() are the inverses of
localtime(3) and gmtime(3). Both functions take a broken-down
time and convert it to calendar time (seconds since the Epoch,
1970-01-01 00:00:00 +0000, UTC). The difference between the two
functions is that timelocal() takes the local timezone into
account when doing the conversion, while timegm() takes the input
value to be Coordinated Universal Time (UTC).
On success, these functions return the calendar time (seconds
since the Epoch), expressed as a value of type time_t. On error,
they return the value (time_t) -1 and set errno to indicate the
error.
EOVERFLOW
The result cannot be represented.
For an explanation of the terms used in this section, see
attributes(7).
┌──────────────────────────┬───────────────┬────────────────────┐
│ Interface │ Attribute │ Value │
├──────────────────────────┼───────────────┼────────────────────┤
│ timelocal(), timegm() │ Thread safety │ MT-Safe env locale │
└──────────────────────────┴───────────────┴────────────────────┘
BSD.
GNU, BSD.
The timelocal() function is equivalent to the POSIX standard
function mktime(3). There is no reason to ever use it.
gmtime(3), localtime(3), mktime(3), tzset(3)
This page is part of the man-pages (Linux kernel and C library
user-space interface documentation) project. Information about
the project can be found at
⟨https://www.kernel.org/doc/man-pages/⟩. If you have a bug report
for this manual page, see
⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.
This page was obtained from the tarball man-pages-6.9.1.tar.gz
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⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on
2024-06-26. If you discover any rendering problems in this HTML
version of the page, or you believe there is a better or more up-
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part of the original manual page), send a mail to
man-pages@man7.org
Linux man-pages 6.9.1 2024-05-02 timegm(3)
Pages that refer to this page: ctime(3)
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HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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