How Do Countries Determine Their Time Zones?

Matthias Kulka / Corbis

From Time Magazine:

Russia wishes it were smaller. No, it isn't about to shed any territory, but President Dmitry Medvedev has suggested that Russia reduce its number of time zones from 11 to four, arguing that the extreme time difference — in which western Russia wakes for breakfast just as eastern Russia climbs into bed — "divides" the country and "makes it harder to manage it effectively." Can Russia just change time zones like that? How are time zones determined anyway?

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