SECS_PER_HOUR
tmp->tm_hour = (int)(rem / SECS_PER_HOUR);
rem = rem % SECS_PER_HOUR;
#define SECS_PER_DAY (SECS_PER_HOUR * 24)
dtime->ts_hour = sec / SECS_PER_HOUR;
sec -= dtime->ts_hour * SECS_PER_HOUR;