Google Mobile has received yet another update to its UI.
In this new interface currently available to only iPhone and Android Phones, you can tap on the button left to the search box, after you search for any query to get all the new search options that Google had introduced recently.
You can refine your search to the latest results ranging from a day to a week and to an year or any custom data range that you want.
You can also refine your searches specifically to only News, or Social Updates or Products as well.
To use this new interface, just go to Google.com on your Safari Browser on your iPhone/iPod touch or default browser on your android device.