Date Difference Calculator

How date difference is calculated

Calendar difference is measured from the earlier date to the later date. Inclusive counting adds one day only to the total day count.

What the result means

Calculate the days, weeks and calendar years/months/days between two dates, with an optional inclusive day count.

Assumptions and scope

UTC calendar dates avoid daylight-saving shifts. Calendar duration and inclusive day totals describe different counting conventions.

Using the calculator

Enter start date, end date, count end date. Change the values to compare results. Calculations run in your browser. No account is required.