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Time, Date, and Localization Functions

The time and date functions are defined in the header . This header defines three time-related types: clock_t, time_t, and tm. The types clock_t and time_t represent the system time and date. This is called the calendar time. The tm structure contains the following members: int tm_sec;  /* seconds, 0-60 */   int tm_min;  /* minutes, 0-59 */   int tm_hour; /* hours, 0-23 */   int tm_mday; /* day of the month, 1-31 */   int tm_mon;  /* months since Jan, 0-11 */   int tm_year; /* years from 1900 */   int tm_wday; /* days since Sunday, 0-6 */   int tm_yday; /* days since Jan 1, 0-365 */   int tm_isdst /* Daylight Saving Time indicator */ tm_isdst is positive during daylight saving time, zero if it not, and negative if there is no information available. This form of the time and date is called the broken-down time. In addition, defines the macro CLOCKS_PER_SEC, which is the number of system clock ticks per second. The geopolitical environmental functions require the header . It defines the structure lconv, which is described under the function localeconv().