So everyone just uses UTC? Keep in mind China now has one timezone. Ask anyone recently from China how that's working out for them. :-P Maybe a better solution

So everyone just uses UTC? Keep in mind China now has one timezone. Ask anyone recently from China how that's working out for them. :-P Maybe a better solution is to always have a UTC15:40 printed on all plane tickets. I had one job where I worked with people in NYC, Colorado and Calgary. I simply had a set of clocks on my bottom status bar with all those respective zones. I could easily tell what time it was for any of my co-workers.