#define CLOCKS_PER_SEC 2000


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;
};

char *asctime(struct tm * tm);
clock_t clock(void);
char *ctime(time_t * clock);
double difftime(time_t t1, time_t t2);
struct tm *gmtime(time_t *clock);
struct tm *localtime(time_t *clock);
time_t mktime(struct tm * tm);
size_t strftime(char * buf, size_t bufsize,char * fmt,struct tm *tm);
time_t time(time_t * tloc);