Date Add / Subtract Calculator

Add or subtract days, weeks, months, or years from any date.

Date (Day)

Month

Year

Amount to Add

Unit

Use Cases

Can I subtract days by using a negative number?

Yes, enter a negative value in the amount field to subtract days, weeks, months, or years from a date.

Does this account for leap years?

Yes, the JavaScript Date object handles leap years automatically. February 29 is valid in leap years, and February 28 is used in non-leap years.

What happens if I add months to January 31?

Adding 1 month to January 31 gives February 28 (or 29 in leap years), as February 31 does not exist. The date automatically adjusts.