Private Sub Worksheet_Change(ByVal Target As Range)
If Not Intersect(Target, Worksheets("Feuil1").Range("A1")) Is Nothing Then
If Not (Left(Target, 4) = UCase(Left(Target, 4)) And Mid(Target, 5, 1) = " " And IsNumeric(Mid(Target, 6, 3)) And Mid(Target, 9, 1) = " " And IsNumeric(Mid(Target, 10, 3)) And Mid(Target, 13, 1) = "/" And IsNumeric(Right(Target, 1))) Then
MsgBox "Mauvais format"
End If
End If
End Sub