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Date Difference Calculator

Pick a start and end date to see the total days between them, the same span in weeks and days, in years, months and days, and in hours. Turn on “Include the end date” to count both the first and last day.

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Method

Dates are compared as whole calendar days in UTC, so daylight-saving changes do not create off-by-one errors. For working days only, use the Business Days Calculator.

Privacy

Calculated locally; nothing is stored.

Common questions

What does “include the end date” change?

It adds one day, e.g. Monday to Friday becomes 5 days instead of 4.

Can the end be before the start?

Yes; the dates are swapped and a note is shown.

Methodology reviewed 2026-10-27. Processing details and test approach.

Useful next steps

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