Date Calculator
Add or subtract time from a date, or calculate the difference between two dates — all in one tool.
How it works
Choose whether you want the difference between two dates, or to add or subtract a number of days, weeks, months, or years from a date. All calculations run locally and handle leap years and month-length differences correctly.
Examples
Figure out what date is 90 days from today, what date was 6 weeks ago, or exactly how far apart two dates are.
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Frequently asked questions
- How does adding months handle short months?
- If adding months would land on a day that doesn't exist in the target month (like January 31st + 1 month), the result is clamped to the last valid day of that month (February 28th or 29th).
- Can I subtract time from a date?
- Yes. Switch to "Subtract time from a date" and enter how many days, weeks, months, or years to go back.
- Is this accurate across leap years?
- Yes. All calculations use real calendar dates, so leap years are handled automatically.
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