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<?php var_dump(new DateTime('2018-06-06', new DateTimeZone('UTC')));
Output for 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 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
object(DateTime)#1 (3) { ["date"]=> string(26) "2018-06-06 00:00:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(3) "UTC" }

preferences:
170.09 ms | 403 KiB | 198 Q