Time zones are regions of the Earth that have the same standard time. They are crucial for standardizing time across countries and regions. Time zones tend to follow the boundaries between countries and their subdivisions instead of strictly following longitude, because it is convenient for areas in frequent communication to keep the same time.
For example, the United States uses nine time zones. From east to west they are Atlantic Time Zone, Eastern Time Zone, Central Time Zone, Mountain Time Zone, Pacific Time Zone, Alaska Time Zone, Hawaii-Aleutian Time Zone, Samoa Time Zone, and Chamorro Time Zone.
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