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Date Difference Calculator
Counting the days between two dates by hand is fiddly, and leap years make it worse. Pick a start date and an end date and this calculator gives the exact gap in days, weeks and months, plus an approximate count of business days between them.
Use the tool
How to use the Date Difference Calculator
- Pick a start date and an end date.
- Adjust any optional settings to match your page, business or campaign.
- Click the button to generate your result instantly — nothing is uploaded; the tool runs in your browser.
- Copy the result, or download it as a file where that option appears, and paste it into your site, document or campaign.
Frequently asked questions
Does it count both the start and end dates?
No. It counts the days from the start date up to, but not including, the end date — so 1 January to 2 January is 1 day.
How are business days counted?
Monday to Friday only, excluding the end date. Public holidays are not excluded, because they vary by country and region.
What about months and years?
Full calendar months and years are shown alongside the exact day count, since a month is not a fixed number of days.