DateTime::toUserTime

public function toUserTime()
{
	//first, move to server timezone
	$this->setDefaultTimeZone();

	//second, adjust time according global timezone offset
	static $diff = null;
	if($diff === null)
	{
		$diff = CTimeZone::GetOffset();
	}
	if($diff <> 0)
	{
		$this->add(($diff < 0? "-":"")."PT".abs($diff)."S");
	}
	return $this;
}