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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.
The boundary between time zones is set forth in the Code of Federal Regulations, with the boundary between the Eastern and Central Time Zones being specifically detailed in 49 C.F.R. part 71. [9] Washington, D.C., and 17 states are located entirely within the Eastern Time Zone. They are:
Location of the state of Indiana in the United States, highlighted in red.. The U.S. state of Indiana is divided into Eastern and Central time zones.The official dividing line has generally moved progressively west from its original location on the Indiana–Ohio border, to a position dividing Indiana down the middle, and finally to its current location along much of the Indiana–Illinois border.
Marker showing the border of Wayne County, Kentucky, and the Eastern Time Zone, coming from Clinton County, same state, Central Time Zone Time in Indiana: red counties belong to the Central Time Zone. roughly follows the border between Wisconsin (to the south and west) and the Upper Peninsula (U.P.) of Michigan (to the north and east); the ...
The North American Central Time Zone (CT) is a time zone in parts of Canada, the United States, Mexico, Central America, and a few Caribbean islands. [1]In parts of that zone (20 states in the US, three provinces or territories in Canada, and several border municipalities in Mexico), the Central Time Zone is affected by two time designations yearly: Central Standard Time (CST) is observed from ...
Nationwide daylight saving time was repealed in 1919, though states and cities still had the option to enact it for themselves, leading to a patchwork of time zones across the country until the ...
The state "could make a data-driven case for moving to the Atlantic Time Zone year-round," the commission said in a draft report released in September. Massachusetts is considering leaving the ...
Time zones of the world. 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.