On the other hand, you have regions such as Spain (which should be UTC-1, but is, like the rest of continental Europe, UTC+1), or even China (where the western border of China is 5 hours offset to neighboring countries).

Obviously, this means that you can’t rely on timezones to determine business times.

And then there’s cultural differences, in some countries people will eat dinner between 21:00 and 22:00, in others around 18:00 – this has obvious consequences for business dinners.