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xkcd #2846: Daylight Saving Choice
(imgs.xkcd.com)
Alt text:
I average out the spring and fall changes and just set my clocks 39 minutes ahead year-round.
Ok, but businesses run about 8 to 17 local no matter where you are in the world, that's much easier to figure out with time zones than having to check the business's schedule every time you need to contact one.