TZConvVTimeZoneRule::__toString

public function __toString()
{
	$rruleString = "FREQ=YEARLY;BYMONTH={$this->month};BYDAY={$this->numwk}{$this->wkday}";

	if ($this->until)
	{
		$rruleString .= ";UNTIL={$this->until->format('YmdTHisZ')}";
	}

	return $rruleString;
}