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Linux man pages : time (2)
TIME(2)			   Linux Programmer's Manual		       TIME(2)

NAME

time - get time in seconds

SYNOPSIS

#include <time.h> time_t time(time_t *t);

DESCRIPTION

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.

RETURN VALUE

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.

ERRORS

EFAULT t points outside your accessible address space.

NOTES

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 na Linux 2.0.30 1997-09-09 TIME(2)