The subject of determining the correct time zone for any city has come up before in this forum. I am interested in pursuing whether some city -> time zone mapping might be possible, but wanted to get the opinions of others here before heading down the wrong path. So, a couple of questions: (1) Has anyone successfully done this? I realize that trying to maintain this mapping manually introduces a technique that will most likely be error-prone. (2) The tz database lists a long/lat for each time zone. If I know the long/lat for a particular location anywhere in the world, is it possible to accurately interpolate the time zone given this information in the database? If so, does anyone know of a good source for long/lat data for major/minor cities? Is this even possible to achieve? Is there a better way? And, I'm only interested in current time/time zone mapping and not worried about historical data, in case that might make the task any easier. Thanks. Rich Shockney