(PECL solr >= 0.9.2)
SolrQuery::addFacetDateField — Maps to facet.date
public SolrQuery::addFacetDateField ( string $dateField ) : SolrQuery
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
dateField
The name of the date field.
Returns a SolrQuery object.
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https://www.php.net/manual/en/solrquery.addfacetdatefield.php