如何在magento 1.9.3中显示10天的售出产品

<?php
class Custom_Sales_Block_RecentProducts extends Mage_Catalog_Block_Product_Abstract
{
    protected function _construct()
    {
        parent::_construct();
        $this->setTemplate('custom/sales/recentproducts.phtml');
    }

    public function getRecentProducts()
    {
        $collection = Mage::getResourceModel('reports/product_collection')
            ->addOrderedQty()
            ->addAttributeToSelect('*')
            ->setOrder('ordered_qty', 'desc')
            ->setPageSize(10);
        return $collection;
    }
}

<?php if ($this->getRecentProducts()): ?>
    <h2>最近10天的售出产品：</h2>
    <ul>
        <?php foreach ($this->getRecentProducts() as $product): ?>
            <li>
                <a href="<?php echo $product->getProductUrl(); ?>">
                    <?php echo $product->getName(); ?>
                </a>
            </li>
        <?php endforeach; ?>
    </ul>
<?php endif; ?>

<layout>
    <default>
        <reference name="content">
            <block type="custom/sales_recentProducts" name="custom.recentProducts" template="custom/sales/recentproducts.phtml" />
        </reference>
    </default>
</layout>