1 #define CLOCKS_PER_SEC 1000000
20 char *asctime(struct tm * tm);
22 char *ctime(time_t * clock);
23 double difftime(time_t t1, time_t t2);
24 struct tm *gmtime(time_t *clock);
25 struct tm *localtime(time_t *clock);
26 time_t mktime(struct tm * tm);
27 size_t strftime(char * buf, size_t bufsize,char * fmt,struct tm *tm);
28 time_t time(time_t * tloc);