Add or Subtract Days
Add or subtract days, weeks, months or years from a date.
How to use the Add or Subtract Days tool
- Enter your add days in the fields above.
- Adjust any slider or type an exact number — the answer updates as you go.
- Copy the result and close the tab. Nothing you entered was sent anywhere.
About the Add or Subtract Days tool
Enter a start date and an amount to add or subtract — days, weeks, months or years. The result updates as you change the input.
When adding months lands on a day that does not exist (e.g. adding 1 month to Jan 31), the calculator clamps to the last day of the target month.
Everything runs locally in your browser: no data is uploaded, no account is needed, and it works offline once the page has loaded.
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