I noticed in some browsers you can find out when the last time a page was modified. For example in firefox... Click on tools > Page Info > Modified:.

I was wondering if there was a way to hide this info from the browser, or make it so it just displays the current time and date like it does on some websites.

Any help would be awesome. Thanks!

If the page is scripted (dynamic) it will ALWAYS show the current time, because it has JUST been created at the time of the request.
Static files however will always show the last time the file was saved to the server.