PHP PThreads and TimeZone

gistfile1.php

<?php

class ThreadParent {

        public function __construct() {
                date_default_timezone_set('UTC');
        }

        public function breed() {
                echo 'Starting..', PHP_EOL;
                $threads = array();
                for ($i = 0; $i < 5; $i++) {
                        $thread = new ThreadChild;
                        $thread->start();
                        $threads[] = $thread;
                }
                foreach ($threads as $thread)
                        $thread->join();
                echo 'Done!', PHP_EOL;
        }

}

class ThreadChild extends Thread {

        public function run() {
                sleep(1);
                echo date('d/m/Y H:i:s'), PHP_EOL;
        }

}

$parent = new ThreadParent;
$parent->breed();