/**
* Expects a timestamp and converts it to an ISO 8601 date in UTC as needed by Solr.
*
* Example date output format: 1995-12-31T23:59:59Z
* The trailing "Z" designates UTC time and is mandatory
*
* @param array Array of values, an array because of multivalued fields
* @return array Modified array of values
*/
public function process(array $values)
{
$results = array();
foreach ($values as $timestamp) {
$results[] = Util::timestampToUtcIso($timestamp);
}
return $results;
}
