There's also a nifty iPhone App for that: GlobeTrotter http://itunes.apple.com/app/globetrotter-timezone-calculator/id355140639 http://itunes.apple.com/app/glo

There's also a nifty iPhone App for that: GlobeTrotter http://itunes.apple.com/app/globetrotter-timezone-calculator/id355140639 http://itunes.apple.com/app/globetrotter-timezone-calculator... Using it all the time because I've had similar problems. And it allows to calculate the differences for more than 2 cities.