time.h

日付けと時刻の関数
 
struct tm {
	int tm_sec;
	int tm_min;
	int tm_hour;
	int tm_mday;
	int tm_mon;
	int tm_year;
	int tm_wday;
	int tm_yday;
	int tm_isdst;
}
 
struct tm clock_t, time_t;
 
clock_t clock(void)
time_t  time(time_t *tp)
double difftime(time_t time2, time_t time1)
timei_t mktime(struct tm *tp)
 
char *asctime(const struct tm *tp)
char   *ctime(const time_t *tp)
 
struct tm    *gmtime(const time_t *tp)
struct tm *localtime(const time_t *tp)
 
size_t strftime(char *s,
                size_t smax,
                const char *fmt,
                const struct tm *tp)