Magento 2.1 – Get Product Name for Order in Dashboard

getProductName() is sales_order_item function which is give products name of a sales item.

In recent don't showing order products ids. it only show order if you want to get order products ids then you need load order

     $order=Mage::getModel('sales/order')->loadByIncrementId($_order->getRealOrderId());

     $items = $order->getAllVisibleItems();
   // OR

    $items = $order->getAllItems();

        foreach($items as $item){
            $name = $item->getName();
        }

The call Mage::app()->getLocale()->date() gives you an object of type Zend_Date. So your question regarding the additional methods like addHour and subDay deal with the Zend class Zend_Date, and not that much with Magento. The API page (http://framework.zend.com/manual/1.12/en/zend.date.overview.html) mentions the magic calls of sub() and add(), so my first reaction is that it should it be working as you mention it. However, I assume you have already tested this, and that it does not work in the way you want it to work. To overcome that, I would say you simply need to create a new class in your own custom Magento module (a helper for instance) that extends from Zend_Date so that you can implement those features you want to. Does that help?