Date Calculator

Find the days, weeks, months and hours between two dates, or add and subtract days, weeks, months and years — instantly and privately.

Days between two dates

Days
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Weeks
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Months & days
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Total hours
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Add to or subtract from a date

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How to use

  1. Pick a start date and an end date to see the gap in days, weeks, months and hours.
  2. Or set a start date, type an amount, choose a unit, and pick add or subtract to see the new date.
  3. Both answers update the moment you change a field — nothing is uploaded and everything stays in your browser.

FAQ

Does the day count include both the start and end date?

No. It counts the whole days from the start date up to the end date, so the same day is 0 days and the next day is 1 day. If you need both ends counted, just add one.

How are months handled when I add to a date?

Months are added by month, then the day is kept the same — but if that day does not exist (for example 31 January plus 1 month), it is clamped to the last day of the target month, so you get 28 (or 29) February.

Is anything sent to a server?

No. Every calculation is plain date maths done in your browser, so the dates you type are never uploaded. The tool works offline and keeps your information private.