— date math —

What date is
X days from now?

Subtract (−)

About the date calculator (add & subtract)

This date calculator adds or subtracts days, weeks, months or years from any start date, and shows you the exact resulting date — along with its day of the week. Enter a date, choose add or subtract, type an amount and a unit, and the answer appears instantly in your browser.

It’s the quick way to answer “what date is 90 days from now?”, find a deadline, a due date or an anniversary, or work backwards from a target date.

What date will it be in X days?

Enter your start date, choose “add”, type the number of days (or weeks, months, years) and the calculator shows the exact resulting date and its weekday.

How do I subtract days from a date?

Pick “subtract”, enter the amount and unit, and the tool counts backwards from your start date to the resulting date.

Does it handle months and leap years?

Yes — adding months or years keeps the day of the month where possible and adjusts for shorter months and leap years (e.g. 31 January + 1 month → 28/29 February).