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Add or Subtract Days from a Date

Find the date a set number of days, weeks, months or years before or after another.

To add or subtract time from a date, enter the starting date, an amount and a unit. The result shows the new date with its day of the week. Enable working days to skip weekends, which is how notice periods and delivery windows are usually counted.

Runs in your browser
Privacy
Runs entirely in your browser — nothing is uploaded
Cost
Free, unlimited, no sign-up

Frequently asked questions

What happens when I add a month to 31 January?

The result clamps to the last valid day of the target month — 28 or 29 February. This matches how spreadsheets and most date libraries behave, and avoids silently rolling over into March.

How to use the add or subtract days from a date

  1. 1Enter or paste your start date.
  2. 2Choose the direction.
  3. 3Set the amount.
  4. 4Choose the unit.
  5. 5Turn "Count working days only" on or off as needed.
  6. 6The result appears immediately — copy or download it.

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Put the working add or subtract days from a date on your own site. It runs in your visitors' browsers exactly as it does here — free, no account, nothing uploaded.

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