| 25. 1. 1. Time, Date, and Localization Functions |
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- 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.
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The tm structure contains the following members: |
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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 */
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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(). |
