Sub ajout_slash()
cellule_nonvide = Application.WorksheetFunction.CountA(Feuil1.Range("$B:$B"))
For i = 2 To cellule_nonvide
Cells(i, 2).Value = Left(Cells(i, 2).Value, 2) & "/" & Mid(Cells(i, 2).valule, 3, 2) & "/" & Right(Cells(i, 2).Value, 5)
Next
End Sub