C/time.h/tm

tm structure

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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.

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