Date Formula Question

Hello, I am creating a formula to pull the month out and then if the date is blank to have the field be blank. Here is the formula I am using:

=MONTH([Activity End Date]@row, IF(ISBLANK([Activity End Date]@row, " ")))

However, I am receiving an "Invalid Data Type" response. I've attached a screen print. If the Activity End Date is blank, I want the "Month" column to be Blank.

Thank you!



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