Private Sub CheckStartLast()

     '''''<<<<< Check for error: Employee's last day cannot be before start day.

     payroll_Start = UserForm9.ComboBox21.Value
     payroll_Last = UserForm9.ComboBox22.Value
     payroll_Diff = WorksheetFunction.IfError(payroll_Last - payroll_Start, "-Check-")

     Select Case payroll_Diff
        Case Is = "-Check-"
           Exit Sub
        Case Is >= 0
           Exit Sub
        Case Is < 0
           MsgBox "Employee's start date cannot be after their last day. Doesn't make sense. Does it to you?"
        Case Else
           Exit Sub
     End Select
End Sub