Online PHP editor | refs for aZ9uN

<?php function buildDatetime($time, $now, $zone) { $datetime = new \DateTime(); $datetime->setTimestamp(strtotime($time, $now)); $datetime->setTimezone(new DateTimezone($zone)); return $datetime; } $now = new \DateTime('2000-01-02 00:00:00', new \DateTimeZone('UTC')); date_default_timezone_set('America/Los_Angeles'); $date = buildDatetime('yesterday', $now->getTimestamp(), 'UTC'); var_dump($date->format('c'), $date->getTimezone()->getName());