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<?php function convertDate($tz, $dt) { if ($tz != "default") { date_default_timezone_set($tz); $new_dt = new DateTime($dt, new DateTimeZone($tz)); return $new_dt->format("d-m-Y H:i:s"); } else { return $dt; } } var_dump(convertDate("America/New_York", "2016-11-31 23:59:58")); var_dump(convertDate("Europe/London", "2016-11-31 23:59:58")); var_dump(convertDate("default", "2016-11-31 23:59:58"));

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