TIME(2) Linux Programmer's Manual TIME(2)
time - get time in seconds
time_t time(time_t *t);
time() returns the time as the number of seconds since the Epoch, 1970-01-01 00:00:00
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 conditions.
POSIX.1 defines seconds since the Epoch using a formula that approximates the number of
seconds between a specified time and the Epoch. This formula takes account of the facts
that all years that are evenly divisible by 4 are leap years, but years that are evenly
divisible by 100 are not leap years unless they are also evenly divisible by 400, in which
case they 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 system clocks are not
required to be synchronized to a standard reference. The intention is that the interpre-
tation of seconds since the Epoch values be consistent; see POSIX.1-2008 Rationale A.4.15
for further rationale.
date(1), gettimeofday(2), ctime(3), ftime(3), time(7)
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Linux 2011-09-09 TIME(2)