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

        // 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->dateCreated)) {
                    $date = is_array($json->dateCreated)
                        ? array_shift($json->dateCreated)
                        : $json->dateCreated;

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

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

        // <meta> tags
        $nodes = $this->article()->getRawDoc()->find('meta[name="parsely-pub-date"]');

        /* @var $node Element */
        foreach ($nodes as $node) {
            try {
                if ($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;
        }

        // parsely-page
        $nodes = $this->article()->getRawDoc()->find('meta[name="parsely-page"]');

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

        return $dt;
    }