While on the subject of time, could you Americans pretty please stop believing that the week starts on Sunday? It's just as wrong as your date format.
Any choice is arbitrary. What is a week to the solar system? The only things that are real are days and years.
That’s not the point.
The point is that in the US people typically work Mon-Fri and loaf around Sat-Sun (weekend) and yet the week starts in Sundays.
It’s infuriating.