I have been using InstantTimezone.com. It is a free download and the 'clock' stays in your the tray next to your computer clock. You can have multiple 'clocks' in your tray and all you have to do is run your mouse over the clock to see the time and location in another part of the country or world. I have clients on the East and West Coasts as well in the Mid-west so this is very helpful when making phone calls or sending emails to them. (I hope I put the link in correctly).