Date Add/Subtract Calculator
Add or subtract days from a base date to calculate the date and weekday a number of days later or earlier. Handy for contract due dates or D+100 calculations — all calculations happen inside your browser.
days
Enter the base date and number of days to see the result.
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Result date
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Weekday
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From the base date
How to use
- Choose Add (later) or Subtract (earlier).
- Enter the base date and number of days.
- The result date and its weekday are shown in real time.
Frequently asked questions
How do I find the date a number of days later?
Pick a base date, choose "Add", then enter the number of days to get the date that many days later. Choose "Subtract" to get the date that many days earlier.
Does the result include the weekday?
Yes. The weekday of the calculated result date is shown too. Handy for checking the weekday of a contract due date or anniversary.
Are the values I enter sent to a server?
No. All calculations happen only inside your browser, and the values you enter are never sent to or stored on any server.