(PECL solr >= 0.9.2)
SolrQuery::getFacetDateFields — Returns all the facet.date fields
public SolrQuery::getFacetDateFields ( ) : array
Returns all the facet.date fields
This function has no parameters.
 Returns all the facet.date fields as an array or null if none was set 
    © 1997–2020 The PHP Documentation Group
Licensed under the Creative Commons Attribution License v3.0 or later.
    https://www.php.net/manual/en/solrquery.getfacetdatefields.php