Public Function NumeroSemaine(dateSemaine As Date) As Integer
NumeroSemaine = DatePart("ww", dateSemaine, vbMonday, vbFirstFourDays)
If NumeroSemaine > 52 Then
If DatePart("ww", dateSemaine + 7, vbMonday, vbFirstFourDays) = 2 Then
NumeroSemaine = 1
End If
End If
End Function