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 sec-
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.
POSIX.1 defines seconds since the Epoch as a value to be interpreted as the number of sec-
onds 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 synchronised to a standard reference. The intention is that the interpre-
tation of seconds since the Epoch values be consistent; see POSIX.1 Annex B 2.2.2 for fur-
SVr4, SVID, POSIX, X/OPEN, BSD 4.3
Under BSD 4.3, this call is obsoleted by gettimeofday(2). POSIX does not specify any
ctime(3), date(1), ftime(3), gettimeofday(2)
Linux 2.0.30 1997-09-09 TIME(2)