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<?php $baseDate = new DateTime('2017-01-01', new DateTimezone('UTC')); var_dump($baseDate);
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.2.6
object(DateTime)#1 (3) { ["date"]=> string(26) "2017-01-01 00:00:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(3) "UTC" }