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<?php $date = new DateTime( '2100-06-02T00:00:00', new DateTimeZone( 'Australia/Sydney' ) ); $date->setTimezone( new DateTimeZone( 'UTC' ) ); $date2010 = new DateTime( '2010-06-02T00:00:00', new DateTimeZone( 'Australia/Sydney' ) ); $date2010->setTimezone( new DateTimeZone( 'UTC' ) ); var_dump( $date, $date2010 );
Output for 8.1.0 - 8.1.30, 8.2.0 - 8.2.26, 8.3.0 - 8.3.14, 8.4.1
object(DateTime)#1 (3) { ["date"]=> string(26) "2100-06-01 14:00:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(3) "UTC" } object(DateTime)#2 (3) { ["date"]=> string(26) "2010-06-01 14:00:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(3) "UTC" }
Output for 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30
object(DateTime)#1 (3) { ["date"]=> string(26) "2100-06-01 13:00:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(3) "UTC" } object(DateTime)#2 (3) { ["date"]=> string(26) "2010-06-01 14:00:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(3) "UTC" }

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