For Each Feuille In ThisWorkbook.Worksheets
If Feuille.Name = Format(Sheets("Vierge").Range("B2"), "dd-mm-yyyy") Then
MsgBox "Feuille existante !"
Exit Sub
End If
Next
Sheets("Vierge").Copy Before:=Sheets(2)
ActiveSheet.Name = Format(Range("B2"), "dd-mm-yyyy")
Range("B2").ClearContents
Range("C1:G1").ClearContents
Range("E2").ClearContents
Range("G2").ClearContents
Range("I2").ClearContents
Range("J1:N1").ClearContents
Range("L2").ClearContents
Range("N2").ClearContents
Range("A1").Select