Find a Blank Column where nobody will intereact
I am using Column O but you may want to use AA or something way acrross there
Copy M9:M84 and paste as values in O9:O84
In O7 =SUM(O9:O84)-SUM(M9:M84)
Then use this code in the worksheet code module:
Code:
Private Sub Worksheet_Change(ByVal Target As Range)
If [O7] = 0 Then Exit Sub
Application.EnableEvents = False
Range("B2").Value = Now()
Range("B2").NumberFormat = "mm/dd/yyyy hh:mm:ss"
Application.EnableEvents = True
Range("M9:M84").Copy
Range("O9:O84").PasteSpecial _
Paste:=xlPasteValues, _
Operation:=xlNone, _
SkipBlanks:=False, _
Transpose:=False
Application.CutCopyMode = False
End Sub
see attached file: