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Date Difference Calculator

Count calendar days between two dates without time-of-day surprises.

Result30 days apart.A precise calendar-day interval without time-of-day complications.

Calculations happen locally in your browser.

How to use this calculator

  1. Choose a start and end date. Reverse them to receive a negative signed difference.
  2. Review the live result and use Copy result when you need to share it.

How the calculation works

Both calendar dates are normalized to UTC midnight before subtracting, so daylight-saving changes do not alter the day count.

Formula

Both calendar dates are normalized to UTC midnight before subtracting, so daylight-saving changes do not alter the day count.

Step-by-step calculation

  1. Choose a start and end date. Reverse them to receive a negative signed difference.
  2. Both calendar dates are normalized to UTC midnight before subtracting, so daylight-saving changes do not alter the day count.
  3. Check the displayed result, then copy it if needed.

Worked example

1 January to 31 January is 30 days apart.

Risk guidance

Frequently asked questions

Does this tool send my inputs anywhere?

No. The interactive calculation runs in your browser and this site does not submit tool inputs to a backend.

How should I use the result?

Check that the entered units and values match your situation, especially around dates, breaks, and rounding.

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