javascript:alert(document.lastModified)
This is PSA for the non-programmers:
It’s pretty often that I’m on a web page and want to know when it was last modified in order to see if the info is out of date. By typing this command into the address bar when you are on a page or saving it as a bookmark and hitting the bookmark, you will get an alert that tells you the modification date on the document. It does not work properly on dynamically generated pages like those of any CMS, including this blog. However, it does come in handy often enough that it’s very useful, particularly since many people do not include the modification date on their pages.