ctime() - transform binary date and time value to ASCII
#include <sys/types.h>
#include <time.h>
char * ctime (const time_t *clock)
The function ctime(3) takes as an argument a time value representing the time in seconds since the Epoch (00:00:00 UTC, January 1, 1970; see time(2)).
Ctime(3) function adjusts the time value for the current time zone and returns a pointer to a 26-character string of the form:
Thu Nov 24 18:22:48 1986\n\0
All the fields have constant width.
date(1)
asctime(3)
difftime(3)
getenv(3)
gmtime(3)
localtime(3)
mktime(3)
time(2)