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xkcd #2846: Daylight Saving Choice
(imgs.xkcd.com)
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But who cares? Everything would be open 8am-5pm GMT regardless if it's sunny or dark outside. Go visit the Grand Canyon at midnight, it's the same as at sunrise or at noon!
No it wouldn't, generally it's healthier for humans to sleep at night, so businesses are going to trend towards operating during sunlight hours.