[krylon]

It is more complex than that. I do not own a car, so I have to use public transportation to get to work, and that dries up outside the main working hours.

Another issue is that it often makes sense for people that work together to be in the same place at the same time.

The implicit assumption that it is somehow morally better to get up early in the morning is very prevalent in Germany, too. I think it's a protestant thing, or at least a Christianity thing - getting up late in the morning implies sleeping in which implies laziness, which is a deadly sin. In fact, I remember listening to an interview with a neurologist (or a biologist whose focus was the nervous system), who said it was absurd to force children to get up as early in the morning as the adults, because for the first one or two lessons, their ability to learn would be impaired anyway.

There is one thing to be said, though, in favour of uniform working hours - it is that you do not need to worry about when your friends are free or working. During my Zivildienst (https://en.wikipedia.org/wiki/Zivildienst) I worked in a hospital in shift work. Working the early shift meant I could not go out the evening before, because I had to get up at 05:00, so I had get to bed early; working the late shift meant that I only got off work when it was already evening.