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<?php $dt = DateTime::createFromFormat('U', 1477850451); print $dt->format('c'); var_dump($dt);
Output for 5.6.0 - 5.6.27, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 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
2016-10-30T18:00:51+00:00object(DateTime)#1 (3) { ["date"]=> string(26) "2016-10-30 18:00:51.000000" ["timezone_type"]=> int(1) ["timezone"]=> string(6) "+00:00" }

preferences:
208.6 ms | 404 KiB | 235 Q