ctime, ctime64 - Date and time (CET)

Definition	#include <time.h> char *ctime(const time_t *sec_ptr); char *ctime64(const time64_t *sec_ptr); ctime and ctime64 interpret the time specification to which sec_ptr points (see return values of mktime, mktime64 and time, time64) as the number of seconds which have passed since the reference date (epoch). The functions calculate the local time (CET) from this and convert the result to a string. ctime and ctime64 behave analogously to localtime and localtime64. Negative values are interpreted as seconds before the reference date. The earliest displayable date with ctime is 12/13/1901 20:45:52 and with ctime64 01/01/1900 00:00:00 local time. By default, the reference date is always 1/1/1970 00:00:00. The latest date which can be displayed with ctime is 01/19/2038 03:14:07 or 3/18/4317 02:44:48 with ctime64.
Return val.	Pointer to the 26-character string generated.
		The resulting string has a length of 26 (incl. the terminating null byte \0) and is formatted as a date and time of the form: Weekday Month Day Hrs:Min:Sec Year, e.g. Thu Jun 14 15:20:54 2018\n\0
	NULL	In the event of an error
Notes	The asctime, ctime, ctime64, gmtime, gmtime64, localtime and localtime64 functions write their result into the same internal C data area. This means that each of these function calls overwrites the previous result of any of the other functions. Time specifications are based on the 24-hour clock.

Example	The following program converts an input value to local time and outputs the result in the form of a date and time. #include <stdio.h> #include <stdlib.h> #include <time.h> int main(void) { time_t sec; sec = time((time_t *)0); printf("%s",ctime(&sec)); return 0; }
See also	asctime, gmtime, gmtime64, localtime, localtime64, mktime, mktime64, time, time64