time - get time in seconds
time_t time(time_t *t);
time returns the time since the Epoch (00:00:00 UTC, Jan
uary 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.
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 naļve basis that
leap seconds are ignored and all years divisible by 4 are
leap years. This value is not the same as the actual num
ber 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 interpretation of seconds since the Epoch values
be consistent; see POSIX.1 Annex B 2.2.2 for further
SVr4, SVID, POSIX, X/OPEN, BSD 4.3
Under BSD 4.3, this call is obsoleted by gettimeofday(2).
POSIX does not specify any error conditions.
ctime(3), date(1), ftime(3), gettimeofday(2)