Merge pull request #154

Author: jmikola

ext_mongodb.php

@@ -1704,13 +1704,10 @@ public function serialize() : string
 
 	public function jsonSerialize() : mixed
 	{
-		$seconds = (int) ( $this->milliseconds / 1000 );
-		$millis =  (int) ( $this->milliseconds % 1000 );
-
-		$d = date_create( "@" . (string) $seconds );
-
 		return [
-			'$date' => sprintf( "%s.%03d+0000", $d->format( 'Y-m-d\TH:i:s' ), $millis )
+			'$date' => [
+				'$numberLong' => (string) $this->milliseconds,
+			],
 		];
 	}
 

tests/json-serialize-utcdatetime.phpt

@@ -14,7 +14,7 @@ var_dump( \MongoDB\BSON\toPHP( \MongoDB\BSON\fromJSON( $d ) ) );
 ?>
 --EXPECTF--
 { "foo" : { "$date" : 1476192866817 } }
-{"foo":{"$date":"2016-10-11T13:34:26.817+0000"}}
+{"foo":{"$date":{"$numberLong":"1476192866817"}}}
 object(stdClass)#%d (%d) {
   ["foo"]=>
   object(MongoDB\BSON\UTCDateTime)#%d (%d) {