PHP: Change UTC time to local time

Did you know that you can quickly change UTC time stamps to Local time by doing the following:

//make sure your time is set
date_default_timezone_set('America/New_York');

$datetime = '2004-02-12T15:19:21+00:00';

//convert the given datetime string to time
$newDatetime = strtotime($datetime);

//re-contruct to format
$newDatetime = date('Y-m-d H:i:s', newDatetime);

It’s so obvious, but I only wished, I knew this before trying all sort of crazy stuff.