Good question. Currently, if it is 6 p.m. In Toronto, Canada, it is also 6 p.m. in New York City. Same time Zone. Now if the US changes it's time zone. 6 p.m. in Toronto becomes 7 p.m. in New York. So airlines, truckers, trains, busses, stock exchanges, border crossing girl scout groups would have to change their schedules to accomodate. Yes, these are only administrative changes (on paper, on screen etc.) but the necessary programing, coordinating and extra work has been estimated to cost business, even American ones millions of dollars.

Of course the option is for every other country to do the same thing. Yeah, like that would happen. they can't even agree to disagree on the Kyoto accord - this is all about saving energy isn't it....hmmm.