4.3BSD - /usr/src/etc/dump.4.1/include.4.1/time.h

   1: struct tm { /* see ctime(3) */
   2:     int tm_sec;
   3:     int tm_min;
   4:     int tm_hour;
   5:     int tm_mday;
   6:     int tm_mon;
   7:     int tm_year;
   8:     int tm_wday;
   9:     int tm_yday;
  10:     int tm_isdst;
  11: };

Defined struct's

Usage of this include