Private Sub Worksheet_Change(ByVal Target As Range)
Dim Eingabe As Variant
On Error GoTo ErrorHandler
If Not Intersect(Target, Columns(1)) Is Nothing Then
Application.EnableEvents = False
With Target
.Value = CDate(Left(Format(Target, "0000"), 2) & ":" & Right(Target, 2))
.NumberFormat = "[hh]:mm"
End With
End If
ErrorHandler:
Application.EnableEvents = True
End Sub