tm_hour Hours since midnight (0–23)
tm_isdst Positive if daylight saving time is in effect;
tm_mday Day of month (1–31)
tm_min Minutes after hour (0–59)
tm_mon Month (0–11; January = 0)
tm_sec Seconds after minute (0–59)
tm_wday Day of week (0–6; Sunday = 0)
tm_yday Day of year (0–365; January 1 = 0)
tm_year Year (current year minus 1900)