Calculators & Converters
Date Add / Subtract
Date Add / Subtract takes a starting date and a number of days, weeks, months or years, then instantly tells you what date results from adding or subtracting that amount. It's useful for working out deadlines, planning ahead for events, calculating a due date, or figuring out what date it was a certain number of days in the past.
The whole calculation runs directly in your browser the moment you enter a value, with no server involved and nothing about your dates ever leaving your device. That makes it quick to try several different intervals in a row without waiting on anything to load.
How to Use the Date Add / Subtract
- Open the Date Add / Subtract tool.
- Enter or select your starting date.
- Enter the number of days, weeks, months or years, and choose whether to add or subtract.
- View the resulting date, recalculated instantly as you change any input.
Frequently Asked Questions
How does the calculator handle months with different lengths?
When adding or subtracting months, the tool adjusts to the nearest valid day in the target month, so a date like adding one month to January 31st lands correctly on the last day of February.
Can I subtract time to find a past date?
Yes, simply choose 'subtract' along with the amount and unit you want, and the tool will calculate the corresponding earlier date.
Does it account for leap years automatically?
Yes, all calculations use the real calendar, so leap years are automatically accounted for whenever February 29th falls within the calculation.