Magento Get all Orders Collection Between Two Dates

/* Format our dates */

$fromDate = date('Y-m-d H:i:s', strtotime($fromDate));
$toDate = date('Y-m-d H:i:s', strtotime($toDate));

/* Get the collection */

$orders = Mage::getModel('sales/order')->getCollection()
    ->addAttributeToFilter('created_at', array('from'=>$fromDate, 'to'=>$toDate))
    ->addAttributeToFilter('status', array('eq' => Mage_Sales_Model_Order::STATE_COMPLETE));