Private Sub Worksheet_Change(ByVal Target As Range)
If Target.Count > 1 Then Exit Sub
If Not Intersect(Target, Range("E5:E15000")) Is Nothing Then
If Target = "" Then
Target.Offset(0, 23).ClearContents
Else
Target.Offset(0, 23) = Format(Date, "mmmm")
End If
End If
End Sub