Add or subtract days, weeks, months, or years from any date instantly
Date Calculation
Quick Presets
Result
How it works: Days and weeks shift the date by the exact number of calendar days. Months and years preserve the day of month where possible — for example, January 31 + 1 month becomes February 28 (or 29 in a leap year). All calculations use local time and no timezone conversion.
The Date Add and Subtract Calculator lets you quickly find a future or past date by adding or subtracting any number of days, weeks, months, or years from a starting date. Whether you are calculating a project deadline, contract expiry, subscription renewal, or payment due date, this free tool gives you the exact result date along with the day of week and ISO format.
Click the 'Today' button to set the start date, choose 'Add' as the operation, enter 30 in the amount field, and select 'Days' as the unit. The result date appears instantly below.
The calculator clamps the result to the last valid day of the target month. For example, January 31 + 1 month becomes February 28 (or February 29 in a leap year), so you never get an invalid date.
Yes. Select 'Subtract' from the Operation dropdown and enter your amount and unit. For example, subtract 6 months from a date to find what date it was half a year ago.
All calculations use your local calendar date with no timezone conversion, so the result matches the date shown on your device's clock rather than a UTC offset.