public function isNew($entity_creation_time, $history_creation_time)
    {
        $lifespan = $this->getLifespan();

        if (empty($history_creation_time)) {
            return (GC_TIME - $entity_creation_time) <= $lifespan;
        }

        return (GC_TIME - $history_creation_time) > $lifespan;
    }