Can it handle dates in the past and future?

Yes. Any two valid dates work, past or future, in either order.

How are months calculated?

Months use calendar months between the dates, while the day count is exact.

Date Difference Calculator

Days, weeks and months between two dates

Start date

End date

Pick both dates to see the difference…

Order does not matter, the earlier date is always measured toward the later one. All math happens in your browser; nothing is sent or stored.

About this tool

How many days until the deadline? How long was that project, exactly? Counting on a calendar is tedious and easy to get wrong, especially across months and leap years.

Enter any two dates and get the precise difference expressed in days, weeks, months and years. Perfect for contracts, pregnancy tracking, project timelines and anniversaries.