public function getArchiveDate() {
		$year = $this->getArchiveYear();
		$month = $this->getArchiveMonth();
		$day = $this->getArchiveDay();

		if($year) {
			if($month) {
				$date = $year . '-' . $month . '-01';
				if($day) {
					$date = $year . '-' . $month . '-' . $day;
				}
			} else {
				$date = $year . '-01-01';
			}
			return DBField::create_field("Date", $date);
		}
	}