USA: Time zones

The continental US spreads over four different time zones, plus one each for Alaska and Hawaii. The Eastern zone is five hours behind Greenwich Mean Time, so 10am London time is 5am in New York City. The Central zone, starting approximately on a line down from Chicago and spreading west to Texas and across the Great Plains, is an hour behind the east. The Mountain zone covers the Rocky Mountains and most of the Southwest and is two hours behind the east coast. The Pacific zone includes the three coastal states and Nevada and is three hours behind New York. Alaska is two hours behind the Pacific zone, as is Hawaii.

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