How do I convert a date/time string (e.g. 2011-01-01 15:00:00) that is UTC to any given timezone php supports, such as America/New_York, or Europe/San_Marino.
PHP's DateTime
object is pretty flexible.
$UTC = new DateTimeZone("UTC");
$newTZ = new DateTimeZone("America/New_York");
$date = new DateTime( "2011-01-01 15:00:00", $UTC );
$date->setTimezone( $newTZ );
echo $date->format('Y-m-d H:i:s');