You think timezones are simple, and then you realize this, when you try to implement them (in the US): https://en.wikipedia.org/wiki/Time_in_the_United_States#B

You think timezones are simple, and then you realize this, when you try to implement them (in the US): https://en.wikipedia.org/wiki/Time_in_the_United_States#Boundaries_between_the_zones https://en.wikipedia.org/wiki/Time_in_the_United_States#Boun... (And that's not counting daylight savings time, and its varied observance!)