Private Sub CommandButton1_Click()
If Me.ComboBox1 = "" Or Me.ComboBox2 = "" Then MsgBox "Saisie manquante", vbCritical, "Saisie": Exit Sub
[mois].Offset(, 3).NumberFormat = "General"
Feuil1.Cells(Application.Match(CLng(CDate(Me.ComboBox1)), Columns([mois].Column), 0), [mois].Column + 3) = CLng(Me.ComboBox2)
End Sub