SolrQuery::addFacetDateField Maps to facet.date &reftitle.description; public SolrQuerySolrQuery::addFacetDateField stringdateField This method allows you to specify a field which should be treated as a facet. It can be used multiple times with different field names to indicate multiple facet fields &reftitle.parameters; dateField The name of the date field. &reftitle.returnvalues; Returns a SolrQuery object.