def METHOD_NAME(self):
    value = self.cleaned_data['billing_dt_select']
    data_list = value.split(',')
    d = dict(zip(['num_days', 'due_sore'], data_list))
    try:
        d['num_days'] = int(d['num_days'])
    except:
        raise forms.ValidationError(_("Number day(s) must be a numeric number."))
    return value