"Last week I described how to use a simple Javascript to determine the age of a Web page. The only problem: if the page has any dynamic elements that update automatically when the page loads (and these days most Web pages do), the script shows the current time and date.
"For pages without auto-update content, type javascript:alert(document.lastModified) into the address bar and press Enter to see a window pop-up with the date and time of the page's last update. I'm still looking for a way to find out how recently specific content on a Web page was updated..."
