Magento how to sort by new products first -

i try use below code code give new product , need new product firs , other prodct.

$todaydate  = mage::app()->getlocale()->date()->tostring(varien_date::datetime_internal_format);  $collection = mage::getmodel('catalog/product')                 ->getcollection()                                    ->addattributetofilter('news_from_date', array('date' => true, 'to' => $todaydate))                 ->addattributetofilter('news_to_date', array('or'=> array(                     0 => array('date' => true, 'from' => $todaydate),                     1 => array('is' => new zend_db_expr('null')))                 ), 'left')                 ->addattributetosort('news_from_date', 'desc')                 ->addattributetosort('created_at', 'desc');  

any 1 idea ??

thanks in advance!!!

install extension sort date

see following step define in image