Online Date Calculator Online Date Calculator Date Calculator Date format MM/DD/YYYY DD/MM/YYYY First date month January February March April May June July August September October November December day calendar_today + Add time duration - Subtract time duration - Subtract date Time duration Second date month January February March April May June July August September October November December day calendar_today settings Calculate clear Reset Date result month January February March April May June July August September October November December Time duration result (years/months/days)