How do I calculate the number of days between two dates?

Enter a start date and end date in the Duration tab. The calculator instantly shows the difference in years, months, weeks, and days.

Can I add or subtract days from a date?

Yes. Use the Add/Subtract tab to add or subtract years, months, weeks, or days from any date.

Business days exclude weekends and public holidays. Our Business Days tab lets you count or add business days with country-specific holidays.

Yes. All calculations run entirely in your browser. No data is sent to any server.

Enter a target date and optional event name. The countdown shows remaining days, hours, minutes, and seconds in real time.

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Days between dates · Add/subtract · Business days · D-Day · Week number

Start Date

End Date

Include end date

Quick presets

Enter two dates to see the gap