Test box

Function MeFDate(Vdate As String)
  Dim VJour As String, VMois As String, VAn As String, NewDate As String
  ' Si la date est VIDE, on veux effacer le champ
  If Vdate = "" Then Exit Function
  ' Si la date est déjà au bon format
  If Len(Vdate) = 10 Then
    MeFDate = Vdate:  Exit Function
  End If
  ' sinon
  Vdate = Replace(Vdate, "/", "")
  VJour = Left(Vdate, 2): VMois = Mid(Vdate, 3, 2)
  VAn = Right(Vdate, Len(Vdate) - 4)
  If Len(VAn) = 2 Then VAn = "20" & VAn
  NewDate = VJour & "/" & VMois & "/" & VAn
  If Not IsDate(NewDate) Then
    MsgBox "Merci de saisir une date valide, au format (jjmmaa ou jj/mm/aaaa)" & vbCrLf _
    & vbCrLf & "Exemple : 010109 ou 01/01/09 ou 01/01/2009 pour 1er Janvier 2009"
    MeFDate = "": Exit Function
  End If
  MeFDate = NewDate
End Function

Private Sub TbDateMvt_AfterUpdate()
  Me.TbDateMvt.Value = MeFDate(Me.TbDateMvt)
  If Me.TbDateMvt = "" Then SendKeys ("+{TAB}")
End Sub

Private Sub UserForm_Click()

   If IsDate(Replace(TextBox1.Text, ".", "/")) And _
      TextBox1.Text Like "??.??.????" _
      And IsNumeric(Split(TextBox1.Text, ".")(0) & _
      Split(TextBox1.Text, ".")(1) & _
      Split(TextBox1.Text, ".")(2)) _
      Then MsgBox "ok"
   Else
      MsgBox "Merci d'entrer une date correcte"
   End If  
   
End Sub