If we throw out daylight saving time, which we can and probably should. We also have to deal with the countries that decided to have fractional time zones, among them Australia (some states at UTC+9:30), India (UTC+05:30) Canada (one province at UTC-3:30) and the weirdest Nepal at UTC+5:45. Also China's insistence on using one time zone when they're big enough to need three, and it's not even the middle one. Here's what currently happens to the map when you use the time zones as they currently exist: https://xkcd.com/1799.
Biting the hand that feeds IT
