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Standard time in the contiguous United States, illustration 1903. From east to west, the four time zones of the contiguous United States are: Eastern Time Zone (Zone R), which comprises roughly the states on the Atlantic coast and the eastern two thirds of the Ohio Valley.
Some U.S. time zones, such as the Samoa Time Zone, are not on this map. This is a list of the time offsets by U.S. states, federal district, and territories. For more about the time zones of the U.S. see time in the United States. Most states are entirely contained within one time zone. However, some states are in two time zones, due to ...
Before time zones were introduced, every place used local observation of the sun to set their clocks, which means they used local mean time, every city different based on their longitude. Detroit used 05:32:11 west of Greenwich and Menominee 05:50:27 west of Greenwich. Time zones were introduced in the United States in 1883.
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. Eastern Standard Time ( EST ) is five hours behind Coordinated Universal Time ( UTC−05:00 ).
The Northeastern United States (also referred to as the Northeast, the East Coast, [b] or the American Northeast) is one of the four census regions defined by the United States Census Bureau. Located on the Atlantic coast of North America , the region borders Canada to its north, the Southern United States to its south, the Midwestern United ...
In 1967, when the Uniform Time Act came into effect, the Upper Peninsula went under year-round Central Standard Time, with no daylight saving time. [42] In 1973, the majority of the peninsula switched to Eastern Standard Time; [ 43 ] only the four western border counties of Gogebic , Iron , Dickinson , and Menominee continue to observe Central ...
The states shown in dark red are usually included, while all or portions of the striped states may or may not be considered part of <region name>. Maps [ edit ]
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 Map of U.S. time zones during between April 2, 2006, and March 11, 2007.