private function getDateFromSchemaOrg(): ?\DateTime {
        $dt = null;

        // Check for HTML tags (<meta>, <time>, etc.)
        $nodes = $this->article()->getRawDoc()->find('*[itemprop="datePublished"]');

        /* @var $node Element */
        foreach ($nodes as $node) {
            try {
                if ($node->hasAttribute('datetime')) {
                    $dt = new \DateTime($node->getAttribute('datetime'));
                    break;
                }
                if ($node->hasAttribute('content')) {
                    $dt = new \DateTime($node->getAttribute('content'));
                    break;
                }
            }
            catch (\Exception $e) {
                // Do nothing here in case the node has unrecognizable date information.
            }
        }

        if (!is_null($dt)) {
            return $dt;
        }

        // Check for JSON-LD
        $nodes = $this->article()->getRawDoc()->find('script[type="application/ld+json"]');

        /* @var $node Element */
        foreach ($nodes as $node) {
            try {
                $json = json_decode($node->text());
                if (isset($json->datePublished)) {
                    $date = is_array($json->datePublished)
                        ? array_shift($json->datePublished)
                        : $json->datePublished;

                    $dt = new \DateTime($date);
                    break;
                }
            }
            catch (\Exception $e) {
                // Do nothing here in case the node has unrecognizable date information.
            }
        }

        return $dt;
    }