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<?php $time = '2000-01-01 00:00:00.000000'; $tz_aus = new DateTimeZone('Australia/Sydney'); $tz_us = new DateTimeZone('America/Los_Angeles'); $auz = new DateTime($time, $tz_aus); $us = new DateTime($time, $tz_us); $diff = $auz->diff($us); var_dump($diff->h);

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