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<?php $time_zones = array( 'America/Chicago', 'GMT', 'Europe/Berlin', ); foreach($time_zones as $time_zone){ date_default_timezone_set($time_zone); $t1 = mktime(23, 0, 0); $t2 = strtotime('today 23:00:00'); echo date('r', $t1) . ' / ' . date('r', $t2) . PHP_EOL; }

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