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<?php $unixTimestamp = 1457459333506; $dt = DateTime::createFromFormat("U.u", $unixTimestamp / 1000); var_dump($dt); echo $dt->format('Y-m-d H:i:s.u');
Output for 5.5.14 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.7
object(DateTime)#1 (3) { ["date"]=> string(26) "2016-03-08 17:48:53.506000" ["timezone_type"]=> int(1) ["timezone"]=> string(6) "+00:00" } 2016-03-08 17:48:53.506000
Output for 5.5.0 - 5.5.13
object(DateTime)#1 (3) { ["date"]=> string(19) "2016-03-08 17:48:53" ["timezone_type"]=> int(1) ["timezone"]=> string(6) "+00:00" } 2016-03-08 17:48:53.506000

preferences:
175.49 ms | 402 KiB | 341 Q