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                                             Hallo Teresa 
Oder als Allgemeines Modul z.b. für einen Button, in Wechselwirkung 
Sub EinAusblenden() 
 Dim DINKW As Integer 
 DINKW = DatePart("ww", Date, vbUseSystemDayOfWeek, vbUseSystem) 
 If DINKW > 1 Then 
  If ActiveSheet.Range(ActiveSheet.Cells(1, 3), ActiveSheet.Cells(1, 2 + DINKW - 1)).EntireColumn.Hidden = False Then 
   ActiveSheet.Range(ActiveSheet.Cells(1, 3), ActiveSheet.Cells(1, 2 + DINKW - 1)).EntireColumn.Hidden = True 
  Else 
   ActiveSheet.Range(ActiveSheet.Cells(1, 3), ActiveSheet.Cells(1, 2 + DINKW - 1)).EntireColumn.Hidden = False 
  End If 
 End If 
End Sub 
  
Gruß Michael 
  
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