Yes, you can. There is a gadget called Versions that will allow you to see the date and time that a page was last published. To enable the Versions gadget:

1. Click the tool icon at the top of the site navigation menu and select Add Gadgets.

    

2. On the screen that pops up, scroll all the way to the bottom of the "All" tab and click on "Versions"

    

3. Now you will be able to see the Versions gadget on the main site list.