Returns the time in seconds since the epoch.
#include <time.h>
time_t time (
time_t *calendar);
(OUT) Points to the object into which the encoded calendar time has been placed.
If successful, returns the current time. Otherwise, returns -1.
The time represents the time in seconds since January 1, 1970 00:00:00 (Universal Coordinated Time), which is the seconds since the epoch. If the calendar parameter is not NULL, the current calendar time is also stored in the object pointed to by the calendar parameter.