Name
timegm, timelocal — inverses of gmtime and localtime
Synopsis
#include <time.h>
time_t
timelocal( |
struct tm *tm); |
time_t
timegm( |
struct tm *tm); |
![[Note]](../stylesheet/note.png) |
Note | ||||
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DESCRIPTION
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).
RETURN VALUE
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.
ATTRIBUTES
For an explanation of the terms used in this section, see attributes(7).
| Interface | Attribute | Value |
timelocal(), timegm() |
Thread safety | MT-Safe env locale |
CONFORMING TO
These functions are nonstandard GNU extensions that are also present on the BSDs. Avoid their use.
NOTES
The timelocal() function is
equivalent to the POSIX standard function mktime(3). There is no
reason to ever use it.
COLOPHON
This page is part of release 5.11 of the Linux man-pages project. A
description of the project, information about reporting bugs,
and the latest version of this page, can be found at
https://www.kernel.org/doc/man−pages/.
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Copyright (C) 2001 Andries Brouwer <aebcwi.nl> %%%LICENSE_START(VERBATIM) Permission is granted to make and distribute verbatim copies of this manual provided the copyright notice and this permission notice are preserved on all copies. Permission is granted to copy and distribute modified versions of this manual under the conditions for verbatim copying, provided that the entire resulting derived work is distributed under the terms of a permission notice identical to this one. Since the Linux kernel and libraries are constantly changing, this manual page may be incorrect or out-of-date. The author(s) assume no responsibility for errors or omissions, or for damages resulting from the use of the information contained herein. The author(s) may not have taken the same level of care in the production of this manual, which is licensed free of charge, as they might when working professionally. Formatted or processed versions of this manual, if unaccompanied by the source, must acknowledge the copyright and authors of this work. %%%LICENSE_END |