def change_svc_notification_timeperiod(self, service, notification_timeperiod):
        """Change service notification timeperiod
        Format of the line that triggers function call::

        CHANGE_SVC_NOTIFICATION_TIMEPERIOD;<host_name>;<service_description>;
        <notification_timeperiod>

        :param service: service to edit
        :type service: alignak.objects.service.Service
        :param notification_timeperiod: timeperiod to set
        :type notification_timeperiod: alignak.objects.timeperiod.Timeperiod
        :return: None
        """
        service.modified_attributes |= DICT_MODATTR["MODATTR_NOTIFICATION_TIMEPERIOD"].value
        service.notification_period = notification_timeperiod
        self.send_an_element(service.get_update_status_brok())