<?php date_default_timezone_set('UTC'); $dt = new DateTime("2015-03-05 01:34:00 +0900"); $dt->modify("front of 1 Asia/Tokyo"); var_dump($dt->format("'Y-m-d H:i:s e'")); $dt = new DateTime("2015-03-05 01:34:00 +0900"); $dt->modify("back of 1 Asia/Tokyo"); var_dump($dt->format("'Y-m-d H:i:s e'"));
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