Sub Convertir_mois()
Dim DerLig%
DerLig = Worksheets("Base").Range("A" & Rows.Count).End(xlUp).Row
With Worksheets("Base").Range("B6:B" & DerLig)
.FormulaR1C1 = "=TEXT(RC[-1],""mmmm"")"
.Value = .Value
End With
With Worksheets("Base").Range("A5:B" & DerLig)
.Sort Key1:=Range("A6"), Order1:=xlDescending, Header:=xlGuess, _
OrderCustom:=1, MatchCase:=False, Orientation:=xlTopToBottom, _
DataOption1:=xlSortNormal
End With
End Sub