Elastica\Util::convertDate PHP Méthode

    public static function convertDate($date)
    {
        if (is_int($date)) {
            $timestamp = $date;
        } else {
            $timestamp = strtotime($date);
        }
        $string = date('Y-m-d\\TH:i:s\\Z', $timestamp);
        return $string;
    }

 public function getQueryForSearch(ArticleSearch $articleSearch)
 {
     // we create a query to return all the articles
     // but if the criteria title is specified, we use it
     if ($articleSearch->getTitle() !== null && $articleSearch != '') {
         $query = new \Elastica\Query\Match();
         $query->setFieldQuery('article.title', $articleSearch->getTitle());
         $query->setFieldFuzziness('article.title', 0.7);
         $query->setFieldMinimumShouldMatch('article.title', '80%');
     } else {
         $query = new \Elastica\Query\MatchAll();
     }
     // then we create filters depending on the chosen criterias
     $boolQuery = new \Elastica\Query\Bool();
     $boolQuery->addMust($query);
     /*
         Dates filter
         We add this filter only the ispublished filter is not at "false"
     */
     if ("false" != $articleSearch->isPublished() && null !== $articleSearch->getDateFrom() && null !== $articleSearch->getDateTo()) {
         $boolQuery->addMust(new \Elastica\Query\Range('publishedAt', array('gte' => \Elastica\Util::convertDate($articleSearch->getDateFrom()->getTimestamp()), 'lte' => \Elastica\Util::convertDate($articleSearch->getDateTo()->getTimestamp()))));
     }
     // Published or not filter
     if ($articleSearch->isPublished() !== null) {
         $boolQuery->addMust(new \Elastica\Query\Terms('published', array($articleSearch->isPublished())));
     }
     $query = new \Elastica\Query($boolQuery);
     $query->setSort(array($articleSearch->getSort() => array('order' => $articleSearch->getDirection())));
     return $query;
 }