6XC

Date Difference Calculator

Calculate the number of days, weeks, months and years between two dates — including how many days until or since an event.

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How Many Days Between Two Dates?

Pick two dates and the tool shows the exact difference as total days, weeks + days, and a years-months-days breakdown. It handles leap years automatically. Use it for deadlines, project timelines, visa or warranty periods, "how many days until…" countdowns and "how many days since…" calculations.

The count is exclusive of the end date's remainder — from 1 January to 31 January is 30 days. Everything runs in your browser.

Frequently Asked Questions

Are both start and end dates counted?

The difference counts the nights between the dates: 1 January to 31 January gives 30 days. If your use case counts both endpoints (some legal deadlines), add 1 to the result.

Are leap years handled?

Yes. The calculation uses real calendar dates, so 29 February and every leap year are automatically included.

Can I calculate days until a future date?

Yes — set the start date to today and the end date to your event. The total-days figure is the countdown.

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