▣ CALCULATORS Updated July 25, 2026

Add or Subtract Days from a Date

Add or subtract time from any date.

Start date
Amount
Unit
Direction
Result
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How it works

Dates are handled in local time with calendar-aware month and year arithmetic, so month ends roll over correctly.

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Frequently asked questions

What happens on 31 January plus one month?

It rolls to early March in the same way spreadsheets do, because February has fewer days.

Can I subtract?

Yes. Enter a negative amount or pick the subtract direction.

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