Select alternative columns as range

Hi, I am trying to use this code I googled to get a time stamp populated. The change I need to make is to select rows 10:50 of every alternative column as the range (instead of the A2:A10).

 Private Sub Worksheet_Change(ByVal Target As Excel.Range)
        With Target
            If .Count > 1 Then Exit Sub
            If Not Intersect(Range("A2:A10"), .Cells) Is Nothing Then
                Application.EnableEvents = False
                With .Offset(0, 1)
                    .NumberFormat = "dd mmm yyyy"
                    .Value = Date
                End With
                Application.EnableEvents = True
            End If
        End With
    End Sub

Thanks for your time.