TIME(2) Linux Programmer's Manual TIME(2)
time - get time in seconds
time_t time(time_t *t);
time() returns the time since the Epoch (00:00:00 UTC, January 1,
1970), measured in seconds.
If t is non-NULL, the return value is also stored in the memory pointed
to by t.
On success, the value of time in seconds since the Epoch is returned.
On error, ((time_t) -1) is returned, and errno is set appropriately.
EFAULT t points outside your accessible address space.
SVr4, 4.3BSD, C89, C99, POSIX.1-2001. POSIX does not specify any error
POSIX.1 defines seconds since the Epoch as a value to be interpreted as
the number of seconds between a specified time and the Epoch, according
to a formula for conversion from UTC equivalent to conversion on the
naive basis that leap seconds are ignored and all years divisible by 4
are leap years. This value is not the same as the actual number of
seconds between the time and the Epoch, because of leap seconds and
because clocks are not required to be synchronized to a standard refer-
ence. The intention is that the interpretation of seconds since the
Epoch values be consistent; see POSIX.1 Annex B 2.2.2 for further
date(1), gettimeofday(2), ctime(3), ftime(3), time(7)
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Linux 1997-09-09 TIME(2)