how does the date appear according to a timezone in php code example

Example 1: php date set utc

<?php
date_default_timezone_set('America/Los_Angeles');
?>

Example 2: php current datettime us time zone

<?php
$date = new DateTime("now", new DateTimeZone('America/New_York') );
echo $date->format('Y-m-d H:i:s');