Add or subtract days calculator

Add or subtract days from a date

Resulting date September 2, 2026 Wednesday

Add or subtract days, months or years from a date to get the resulting date and day of the week.

This date calculator adds or subtracts days, months or years from a date and shows you the resulting date and day of the week.

Plan deadlines and events

Working out what date it’ll be in 90 days, or what date it was 6 months ago, is common when tracking deadlines, contracts, deliveries or personal milestones. Pick a starting date, an amount and a unit, and the resulting date updates instantly.

FAQ

Can I subtract time instead of adding it?

Yes. Choose "Subtract" as the operation and the tool will count backwards from your starting date.

Which units can I use?

Days, months or years. Months and years are added calendar-wise, so the day of the month can shift for shorter months (e.g. adding a month to 31 January gives 28 or 29 February).

Does it tell me the day of the week?

Yes, the result shows both the full date and the weekday it falls on.