This is a very good point. I used this site to see what the two browsers I have installed send back (Netscape 7.2 and IE 6.0, both on Win2K). Neither sends a Date header for a GET. In addition, my O'Reilly HTTP: The Definitive Gude says that sent dates may not contain time zones and may not be GMT. So I'd have to vote for a JS method. The only other intriguing idea, just for the pure geekiness of it, is to take the IP address from the HTTP header and do a look up at one of these IP geographic location sites.