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How to count unique/duplicate dates in an Excel column?

Author Sun Last modified

In a list of dates with some duplicate dates and unique dates, and for some purposes, you want to count only the unique dates or the duplicate dates in the list, how could you quickly count them instead of manual counting? This tutorial can tell you the tricks.

Count unique dates in a column with formula

Count and color unique/duplicate date in a column with Kutools for Excel

arrow blue right bubble Count unique dates in a column with formula

In Excel, there is a formula can help you to count all unique dates including the first duplicate ones in a list.

Select a blank cell, for instance, B2, and type this formula =SUMPRODUCT(1/COUNTIF(A2:A22,A2:A22)) in to it, and press Enter, you can get the counting result.

A screenshot of Excel formula example for counting unique dates
A screenshot showing result of unique date count formula in Excel

In above formula, A2:A22 is the range from which you want to count unique dates; you can adjust it as needed.

arrow blue right bubble Count and color unique/duplicate dates in a column with Kutools for Excel

If you want to count and color the unique dates excluding the first duplicate ones, or count the duplicate dates, you can use Kutools for Excel’s Select Duplicate & Unique Cells utility to help you solve it.

Kutools for Excel, equipped with AI 🤖, offers over 300 handy features to simplify your tasks.

After free installing Kutools for Excel, please do as below:

1. Select the range you want to count unique or duplicate dates, and click Kutools > Select > Select Duplicate & Unique Cells. See screenshot:

A screenshot of Kutools Select Duplicate & Unique Cells option in Excel

2. In the Select Duplicate & Unique Cells dialog, check the option as you need in Rule section, and then if you want to color the selected cells, check Fill backcolor or Fill font color checkbox to select a color as you need in Processing of results section. See screenshot:

A screenshot of the Select Duplicate & Unique Cells dialog with color options

3. Click Ok, and a dialog pops out to tell you the counting result, and at the same time, the selected cells are colored. See screenshot:

A screenshot showing colored unique and duplicate cells in Excel after using Kutools

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