You would need a macro to be placed in the code module of the worksheet
containing the range. Something like:

Private Sub Worksheet_Change(ByVal Target As Range)
If Not Intersect(Target, Range("C1:D10")) Is Nothing Then Range("A1") =
Date
End Sub
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"Penny" wrote in message
...
I would like to add a function to a worksheet that would identify "last
modification date" of a specific range.