Sub Mon_Format()
Application.ScreenUpdating = False
Dim Derlig&
Derlig = Worksheets("Feuil1").Range("B" & Rows.Count).End(xlUp).Row
For i = 2 To Derlig
Range("D" & i).Value = Format(Range("D" & i).Value, "000") & "/BEL/" & Year(Range("B" & i).Value)
Next i
End Sub