Excel Formula: Calculate overlapping days between two date ranges

In this tutorial, it provides a formula to calculate the overlapping days between two date ranges in Excel. For example, the first given date range is 1/1/2020-6/20/2020, and the project A is proceeded in the date range 8/16/2019-1/2/2020, there are 2 overlapping days between these two date ranges as above screenshot shown.

If you want to follow along with this tutorial, please download the example spreadsheet.

Generic formula:

MAX(MIN(end1,end2)-MAX(start1,start2)+1,0)

Arguments

End1, start1: the end date and start date in the first date range.

End 2, start2: the end date and start date in the second date range.

Return value

The formula returns the overlapping days with a numeric value.

How this formula work

Here the projects are proceeded in different date ranges, we want to calculate the overlapping days between date range of each project and a given fixed date range in Range C2:C3.

In cell H3, please use below formula:

=MAX(MIN($C$3,G3)-MAX($C$2,F3)+1,0)

Press Enter key then drag autofill handle below to calculate the overlapping days.

Explanation

MIN function is used to find the minimum value in many values. Here it finds out the earlier date between the two end dates.

MAX function is used to find the maximum value in values.

The inner MAX function finds out the later date between two start dates.

To include both start date and end date, we offset the result by adding 1.

=MAX(MIN($C$3,G3)-MAX($C$2,F3)+1,0)
=MAX(43832-43831+1,0)

The outer MAX function is used to display the negative value instead of zero.

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