Well, turning a dial on your wrist or pressing a few buttons is one thing, but when it comes down to code you're looking at a lot more complication than that.

Well, turning a dial on your wrist or pressing a few buttons is one thing, but when it comes down to code you're looking at a lot more complication than that. Knowing how to correctly handle time as a programmer is anything but trivial. It's so not-trivial we even have a database of historical changes in timezones and DSTs in order to maintain backwards compatibility for it.