Date Calculator

Count the days between two dates, or add and subtract days from any date. Everything runs in your browser — nothing is sent anywhere.

Last updated: 8 November 2026

Popular right now

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How to use the date calculator

Days between dates: pick a start and an end date. The result shows the number of days between them, plus the same span in weeks and days, and in months and days. By default the end date is not counted — from Monday to Tuesday is one day. Tick "include end date" if you need to count both days, for example when working out the length of a holiday or a hotel stay in nights versus days.

Add or subtract days: choose a date and enter a number of days. Use a negative number to go back in time. This is handy for deadlines ("30 days from today"), notice periods, visa stays and due dates.

For working days only, use the business days calculator, which skips weekends and, optionally, public holidays.

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Frequently asked questions

How do I count the days between two dates?

Enter both dates in the calculator above. It shows the difference in days, weeks and months.

Does the calculator include the end date?

Not by default. Tick the box to count both the start and end dates.

Can I calculate a date 90 days from today?

Yes. Use 'add or subtract days', choose today and enter 90.

Is my data stored?

No. All calculations run in your browser.