Time.h
This header file defines structures, macros and functions for manipulating date and time.
Useful for timing your programtypedef long clock_t;typedef long time_t;struct tm { int tm_sec; /* secondes after the minute*/ int tm_min; /* minutes after the hour */ int tm_hour; /* hours after midnight */ int tm_mday; /* day of the month */ int tm_mon; /* months since January */ int tm_year; /* years since 1990 */ int tm_wday; /* days since Sunday */ int tm_yday; /* days since 1 January */ int tm_isdst; /*Daylight Savings Time flag */ };