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Different regions of the planet are generally bounded by vertical lines of longitude, determining which standard time zone countries, cities and destinations fall within. These zones are legally endorsed and generally known as the local time.
In total, maps shows some 24 different main world time zones in existence, with each of these used as global calculators for their local time using Coordinated Universal Time, which is abbreviated as UTC. In essence this is the same as Greenwich Mean Time (GMT), created in 1675 to aid sailors.
World zones are generally described according to UTC, e.g. New York is within the Eastern Time Zone (EST) as UTC-5, observing Eastern Daylight Time (EDT) as UTC-4.
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