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Add days to a date

The math stays in this tab. Nothing is uploaded.

New date

Result
2026-12-03

How to use this tool

Add or subtract whole days from a calendar date in this tab. Nothing is uploaded.

  1. Open Add days to a date

    Today and +30 days are already filled. The new date sits on the right.

  2. Change the date or the day count

    Negative days go backwards. Leap days are included.

  3. Copy the new date

    Copy puts YYYY-MM-DD on the clipboard.

FAQ

Can I add days to a date here?

Yes. Pick a date and a whole number of days. Negative numbers go backwards.

Is this uploaded?

No. The math stays in this tab.

Do leap days count?

Yes. 28 Feb 2024 plus 1 day is 29 Feb 2024.

Are times included?

No. These are civil calendar dates (YYYY-MM-DD), not clock times.

Can I copy the result?

Yes. Copy puts the new date on the clipboard.