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The Eastern Time Zone ( ET) is a time zone encompassing part or all of 23 states in the eastern part of the United States, parts of eastern Canada, and the state of Quintana Roo in Mexico .
Time in the United States. In the United States, time is divided into nine standard time zones covering the states, territories and other US possessions, with most of the country observing daylight saving time (DST) for approximately the spring, summer, and fall months.
History of time in the United States. The evolution of United States standard time zone boundaries from 1919 to 2024 in five-year increments. Plaque in Chicago marking the creation of the four time zones of the continental US in 1883. Colorized 1913 time zone map of the United States, showing boundaries very different from today.
Standard time (winter) Eastern Standard Time (EST) UTC−05:00. Daylight time (summer) Eastern Daylight Time (EDT) UTC−04:00. Independent of daylight saving time, solar noon on the March equinox is about 12:00 in Western Massachusetts and 11:47 in Nantucket to the east. New England, which includes Massachusetts, is one of the few areas in the ...
A time zone is an area which observes a uniform standard time for legal, commercial and social purposes. 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.
Map of Florida time zones. Counties in red follow central time. Counties in yellow follow eastern time. Counties with a checkerboard pattern have areas that follow both time zones.
UTC−05:00 is an identifier for a time offset from UTC of −05:00. In North America, it is observed in the Eastern Time Zone during standard time, and in the Central Time Zone during the other eight months (see Daylight saving time ). The western Caribbean uses it year round.
Most of the United States observes daylight saving time, the practice of setting the clock forward by one hour when there is longer daylight during the day, so that evenings have more daylight and mornings have less. Exceptions include Arizona (except for the Navajo, who do observe daylight saving time in the Navajo Nation ), [1] Hawaii, [2] and the territories of American Samoa, Guam, the ...