$extra=array_merge($extra,array(array('key'=>'pubDate','value'=>date('r',$item->created)),array('key'=>'dc:creator','value'=>$item->name),array('key'=>'guid','value'=>$item->nid.' at '.$base_url,'attributes'=>array('isPermaLink'=>'false'))));
$extra=array_merge($extra,array(array('key'=>'pubDate','value'=>format_date($item->created,'custom','r')),array('key'=>'dc:creator','value'=>$item->name),array('key'=>'guid','value'=>$item->nid.' at '.$base_url,'attributes'=>array('isPermaLink'=>'false'))));