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<?php $first = (new DateTime('2018-07-01 04:00:00.000000 America/Toronto')); $second = new DateTime('2018-07-02 00:00:00.000000 America/Toronto'); $third = (new DateTime('2018-07-01 00:00:00.000000 America/Toronto')) ->setTimezone(new DateTimeZone('UTC')); var_dump( $first->diff($second), $third->diff($second) );

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