Restrict User To Enter Permissible Date Range Values Only In TextBox

[MrBlackd]

Hi, I have a form that has a specific textbox named DateBox and I want to restrict the user from entering any date later than 25 November 2013.
Any quick ideas on how to do this?

I have searched quickly but did not manage to find something suitable.
Thanks in advance for any reply.

I have tried something like this but it is not working...

Private Sub Datebox_Change()
Dim maxdate As String
maxdate = "25/11/2013"
If Datebox.Value > maxdate Then
MsgBox "You have entered an invalid date"
Else
Exit Sub
End If
End Sub