Sum between two dates but left blank if there is no date in one of the columns


Hi there,

I am looking for the formula to find the number of days it took between two dates only if there is a date added in Column A.

I have used and this worked great to get the days but if there are any blanks in Column A it comes back as a 0 and I am looking for it to be blank instead.

What do I need to add to make it blank if there is no date in column A?

=SUM([Column A]@row - [Column B]@row)

Thank you


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