function getGlobalDateFilter() {
		if ($this->dateFilter) return $this->dateFilter;
		
		$this->dateFilter = null;
		Gen::includeClass('PntSqlFilter', 'pnt/db/query');
		global $site;
		$filters = $site->getGlobalFilters();
		reset($filters);
		while (list($key) = each($filters))
			if ($filters[$key]->getId() == 'date')
				$this->dateFilter = $filters[$key];
				
		return $this->dateFilter;
	}