инверсия gmtime и местного времени (inverses of gmtime and localtime)
Имя (Name)
timegm, timelocal - inverses of gmtime and localtime
Синопсис (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():
Since glibc 2.19:
_DEFAULT_SOURCE
Glibc 2.19 and earlier:
_BSD_SOURCE || _SVID_SOURCE
Описание (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).
Возвращаемое значение (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.
Ошибки (Error)
EOVERFLOW
The result cannot be represented.
Атрибуты (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 │
└───────────────────────────┴───────────────┴────────────────────┘
Стандарты (Conforming to)
These functions are nonstandard GNU extensions that are also
present on the BSDs. Avoid their use.
Примечание (Note)
The timelocal() function is equivalent to the POSIX standard
function mktime(3). There is no reason to ever use it.
Смотри также (See also)
gmtime(3), localtime(3), mktime(3), tzset(3)
