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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:
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. The time zone boundaries and DST observance are regulated by the Department ...
Time in Kentucky. About 60% of Kentucky lies in the Eastern Time Zone, with the rest in the Central Time Zone, as follows: [1] Counties to the north and east of this boundary are in the Eastern Time Zone, while counties to the south and west are in the Central Time Zone. 30% of the area in Eastern Time Zone is further west than areas to the south.
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.
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.
Time in Tennessee, as in all U.S. states, is regulated by the United States Department of Transportation. About 73 percent of the counties in the state of Tennessee lie in the Central Time Zone, mostly the western and middle grand divisions, while East Tennessee is mostly in the Eastern Time Zone except for three counties in that division. [1][2]
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.
UTC−08:00 (Zone 4 or Northwest Zone) – State of Baja California. UTC−07:00 (Zone 3 or Pacific Zone) – States of Baja California Sur, Chihuahua, Nayarit, Sinaloa and Sonora. UTC−06:00 (Zone 2 or Central Zone) – Most of Mexico. UTC−05:00 (Zone 1 or Southeast Zone) – State of Quintana Roo. Time in Mexico. Chile.