time.h library

#include <time.h>

• NULL
• CLOCKS_PER_SEC
  The number per second of the value returned by the clock function.

• clock_t
  an arithmetic type capable of representing time
• time_t
  an arithmetic type capable of representing time

struct tm
• int tm_sec;
  seconds after the minute
• int tm_min;
  minutes after the hour
• int tm_hour;
  hours since midnight
• int tm_mday;
  day of the month
• int tm_mon;
  months since January
• int tm_year;
  years since 1900
• int tm_wday;
  days since Sunday
• int tm_yday;
  days since January 1
• int tm_isdst;
  Daylight Saving Time flag

• clock_t clock(void);
  
• double difftime(time_t time1, time_t time0);
  
• time_t mktime(struct tim *timeptr);
  
• time_t time(time_t *timer);
  
• char *asctime(const struct tm *timeptr);
  
• char *ctime(const time_t *timer);
  
• struct tm *gmtime(const time_t *timer);
  
• struct tm *localtime(const time_t *timer);
  
• size_t strftime(char *s, size_t maxsize, const char *format, const struct tm *timeptr);