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<?php $tz = new DateTimeZone('America/New_York'); $from = new DateTime('2019-06-01T00:00:00', $tz); $from = $from->setTimezone(new DateTimeZone('UTC')); var_dump($from); $to = new DateTime('2019-10-01T00:00:00', $tz); $to = $to->setTimezone(new DateTimeZone('UTC')); var_dump($to); $tz = new DateTimeZone('Asia/Tokyo'); $from = new DateTime('2019-06-01T00:00:00', $tz); $from = $from->setTimezone(new DateTimeZone('UTC')); var_dump($from); $to = new DateTime('2019-10-01T00:00:00', $tz); $to = $to->setTimezone(new DateTimeZone('UTC')); var_dump($to);
Output for 7.2.0 - 7.2.33, 7.3.0 - 7.3.21, 7.4.0 - 7.4.10, 8.0.0alpha1 - beta3
object(DateTime)#2 (3) { ["date"]=> string(26) "2019-06-01 04:00:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(3) "UTC" } object(DateTime)#3 (3) { ["date"]=> string(26) "2019-10-01 04:00:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(3) "UTC" } object(DateTime)#1 (3) { ["date"]=> string(26) "2019-05-31 15:00:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(3) "UTC" } object(DateTime)#2 (3) { ["date"]=> string(26) "2019-09-30 15:00:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(3) "UTC" }