timelocal3
Inverses of gmtime and localtime
Part of timegm(3).
Usage
Since glibc
2.19:
_DEFAULT_SOURCE
glibc 2.19
and
earlier:
_BSD_SOURCE { | | _SVID_SOURCE}
Library
Standard C library (libc, -lc)
Overview
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.
Errors
- EOVERFLOW
-
The result cannot be represented.
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 |
History
- Arch Linux 2026-11-01: the text shown here
- Debian 13 (Trixie)
- Debian 12 (Bookworm)
- Debian 11 (Bullseye)
- Debian 10 (Buster)
- Debian 9 (Stretch)
- Debian 8 (Jessie)
- Debian 7 (Wheezy)
- Debian 6.0 (Squeeze)
- Debian 5.0 (Lenny)
- Debian 4.0 (Etch)
- Debian 3.1 (Sarge)