Implements __toString() for dates.
The base DateTime class does not implement this.
https://bugs.php.net/bug.php?id=62911
http://www.serverphorums.com/read.php?7,555645
public function __toString() {
$format = static::FORMAT;
return $this
->format($format) . ' ' . $this
->getTimeZone()
->getName();
}