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<?php var_dump(new DateTime('2017-01-01 12:12:12.123'));
based on pJpIE
Output for 5.6.0 - 5.6.30, hhvm-3.18.5 - 3.22.0, 7.0.0 - 7.3.0rc2
object(DateTime)#1 (3) { ["date"]=> string(26) "2017-01-01 12:12:12.123000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }