Add or subtract days

Find the date a number of calendar days before or after another.

Runs on your device Works offline after setup All Utilities

Start date

Days to add (negative to subtract)

Enter your values, then choose Calculate.

Limits

UTC calendar dates from year 0001 to 9999. Days must be a safe whole number. Approximate real-number outputs use 12 significant digits unless a unit specifies otherwise.
Desktop limits are provisional. Physical mobile and Safari verification remains open.

What happens to your data

Add or subtract days runs inside this browser tab, and the page's code comes from this site. There is no application server to receive your data, and the site's security policy limits connections to this site.

How local processing works

Good to know

UTC calendar dates from year 0001 to 9999. Days must be a safe whole number. Approximate real-number outputs use 12 significant digits unless a unit specifies otherwise.
Desktop limits are provisional. Physical mobile and Safari verification remains open.