#include <time.h>

       time_t time(time_t *t);

       time()  returns  the  time  as  the  number of seconds since the Epoch,
       1970-01-01 00:00:00 +0000 (UTC).

       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 using a formula that approxi-
       mates 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  synchro-
       nized  to  a standard reference.  The intention is that the interpreta-
       tion 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)

       This  page  is  part of release 3.35 of the Linux man-pages project.  A
       description of the project, and information about reporting  bugs,  can
       be found at http://man7.org/linux/man-pages/.

Linux                             2011-09-09                           TIME(2)
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