default datetime zone in php America/New_York code example
Example 1: php default timezone
date_default_timezone_set("Asia/Kolkata");
// List of Supported Timezones https://www.php.net/manual/en/timezones.php
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');