It's pretty simple really - twice every year we do this ritual of changing our clocks and what does it do for us exactly?
Plus if you live in, or do business with Arizona those guys don't observe DST so you have to constantly guess if they're 2 or 3 hours different..
Daylight Savings Time probably made sense 100 years ago, so did horse hitching posts in front of businesses and cuspidors for people to spit chewing tobacco into. It's 2015 and maybe we should act like it.