- date_create: documentation ( source)
- timezone_open: documentation ( source)
- date_timezone_set: documentation ( source)
<?php
$dt = date_create();
date_timezone_set($dt, timezone_open('EST'));
echo $dt->format('m-d H:i') ."\n\n";
date_timezone_set($dt, timezone_open('EST'));
echo $dt->format('m-d H:i');