Timezones, how do they work?

It won't matter how they work if you get this watch. From Uncrate:

Manually setting your watch is so last millennia. The Citizen Eco-Drive Satellite Wave Watch ($TBA) searches from the closest of 24 navigation satellites to set the day, date, and time, providing you with consistently accurate time, while the Eco-Drive system uses light to keep it powered, the world time function keeps you on tabs with the time in 26 cities, and the ceramic and stainless steel case keeps you looking good.