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How to use Add or Subtract Days

Enter a starting date and how many days to add or subtract, and the tool calculates the exact resulting date and its weekday.

Frequently asked questions

What can I use this for?

Common uses: finding a deadline 90 days from today, a 30-day notice period end date, a return-window date, or medication schedules.

Does it handle months and leap years?

Yes. The calculation uses real calendar dates so month lengths and leap years are always correct.

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