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Rick
 
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Default #NUM! in Date field calculation

Great site for help!
I have 3 cells.
A1 is a date cell (formatted for date mmm/yy) in which I input a start date.
A2 is a numeric value representing the length of a project in months.
A3 contains this formula =(DATE(YEAR(A1),MONTH(A1)+(A2-1),DAY(A1)) and is
formatted as a date cell.

It works to a fashion except it returns #NUM! when there is nothing in cell
A1 & A2.

How do I fix this or get around it?
I want the cell A3 to show nothing unless both A1 & A2 have inputs.
 
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