(PECL solr >= 0.9.2)
SolrQuery::getFacetDateStart — Returns the lower bound for the first date range for all date faceting on this field
public SolrQuery::getFacetDateStart ([ string $field_override ] ) : string
Returns the lower bound for the first date range for all date faceting on this field. Accepts an optional field override
field_override
The name of the field
Returns a string on success and null if not set
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https://www.php.net/manual/en/solrquery.getfacetdatestart.php