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   timegm    ( 3 )

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Имя (Name)

timegm, timelocal - inverses of gmtime and localtime

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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

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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).

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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.

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Ошибки (Error)

EOVERFLOW
              The result cannot be represented.

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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 │
       └───────────────────────────┴───────────────┴────────────────────┘

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Стандарты (Conforming to)

These functions are nonstandard GNU extensions that are also
       present on the BSDs.  Avoid their use.

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Примечание (Note)

The timelocal() function is equivalent to the POSIX standard
       function mktime(3).  There is no reason to ever use it.

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Смотри также (See also)

gmtime(3), localtime(3), mktime(3), tzset(3)

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