It handles month-end edge cases properly: adding one month to 31 January gives the last day of February, not a non-existent 31 February. Deadlines, contract periods, notice periods and visa windows all become much easier to check. If you need the gap between two known dates instead, use the Days Between Dates Calculator.
Calculator
How to use the Date Calculator
- Choose the date you want to start from.
- Select Add or Subtract.
- Type how many days, weeks, months or years.
- Pick the unit and read the resulting date and weekday.
About this tool
The Date Calculator is built for speed and accuracy: every calculation runs in your browser, so your data never leaves your device and the result updates as you type. It works equally well on a phone, a tablet or a desktop, and it is free to use as many times as you like.
Common use cases
- Finding a deadline 30, 60 or 90 days away.
- Working out a notice period end date.
- Checking a warranty or subscription expiry.
- Planning a date a fixed number of months ahead.
Tips for the best result
- Use the latest figures you have - even a small change in rate or term can shift the outcome by hundreds.
- For annual figures, divide by 12 to get a monthly number you can compare with the result.
- Bookmark this page and revisit the calculation as the inputs change.
Frequently asked questions
Does it handle month-end dates?
Yes. If the target month is shorter, the last day of that month is returned instead of rolling into the next month.
Are public holidays excluded?
No, this tool counts calendar days. Use the Business Days Calculator if you need working days only.
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