You can use the following formula to count the number of occurrences by month in an Excel spreadsheet:

=SUMPRODUCT(1*(MONTH(A1:A10)=11))

This particular formula counts the number of dates in the range **A1:A10** that occur in the eleventh month (November) of the year.

The following example shows how to use this formula in practice.

**Example: Count by Month in Excel**

Suppose we have the following dataset that shows the sales of some product on various dates:

Now suppose we’d like to count the number of dates by month.

To generate a list of unique month numbers, we can use the following formula:

=SORT(UNIQUE(MONTH(A2:A15)))

We’ll type this formula into cell **D2**:

Next, we can use the following formula to count the number of dates by month:

=SUMPRODUCT(1*(MONTH($A$2:$A$15)=D2))

We’ll type this formula into cell **E2**, then copy and paste it into each remaining cell in column E:

From the output we can see:

- Month 1 (January) occurred
**4**times. - Month 2 (February) occurred
**3**times. - Month 3 (March) occurred
**1**time.

And so on.

**Additional Resources**

The following tutorials explain how to perform other common tasks in Excel:

How to Use COUNTIF with OR in Excel

How to Count If Cells Contain Text in Excel

How to Count Unique Values Based on Multiple Criteria in Excel