SolrSearchRequest::setToDate PHP Method

    function setToDate($toDate)
    {
        $this->_toDate = $toDate;
    }

 /**
  * AJAX request for search query auto-completion.
  * @param $args array
  * @param $request Request
  * @return JSON string
  */
 function queryAutocomplete($args, $request)
 {
     $this->validate(null, $request);
     // Check whether auto-suggest is enabled.
     $suggestionList = array();
     $lucenePlugin = $this->_getLucenePlugin();
     $enabled = (bool) $lucenePlugin->getSetting(0, 'autosuggest');
     if ($enabled) {
         // Retrieve search criteria from the user input.
         $articleSearch = new ArticleSearch();
         $searchFilters = $articleSearch->getSearchFilters($request);
         // Get the autosuggest input and remove it from
         // the filter array.
         $autosuggestField = $request->getUserVar('searchField');
         $userInput = $searchFilters[$autosuggestField];
         if (isset($searchFilters[$autosuggestField])) {
             unset($searchFilters[$autosuggestField]);
         }
         // Instantiate a search request.
         $searchRequest = new SolrSearchRequest();
         $searchRequest->setJournal($searchFilters['searchJournal']);
         $searchRequest->setFromDate($searchFilters['fromDate']);
         $searchRequest->setToDate($searchFilters['toDate']);
         $keywords = $articleSearch->getKeywordsFromSearchFilters($searchFilters);
         $searchRequest->addQueryFromKeywords($keywords);
         // Get the web service.
         $solrWebService = $lucenePlugin->getSolrWebService();
         /* @var $solrWebService SolrWebService */
         $suggestions = $solrWebService->getAutosuggestions($searchRequest, $autosuggestField, $userInput, (int) $lucenePlugin->getSetting(0, 'autosuggestType'));
         // Prepare a suggestion list as understood by the
         // autocomplete JS handler.
         foreach ($suggestions as $suggestion) {
             $suggestionList[] = array('label' => $suggestion, 'value' => $suggestion);
         }
     }
     // Return the suggestions as JSON message.
     $json = new JSONMessage(true, $suggestionList);
     return $json->getString();
 }