Hi beamer,
"Each time the sheet is edited" implies you need an EVENT macro that lives behind the worksheet. The event is "On_Change" and will trigger whenever something on that worksheet is changed. Then you need to find the LastRow in Column A and put something in it. I guess showing you is easier than telling you. See the attached with this code.
Private Sub Worksheet_Change(ByVal Target As Range)
Dim LastRow As Double
Application.EnableEvents = False
LastRow = Cells(Rows.Count, "A").End(xlUp).Row
Cells(LastRow + 1, "A") = Now()
Application.EnableEvents = True
End Sub
Attachment 469034
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