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The tz database partitions the world into regions where local clocks all show the same time. This map was made by combining version 2023d with OpenStreetMap data, using open source software. [1] This is a list of time zones from release 2025a of the tz database. [2]
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]
Before the adoption of four standard time zones for the continental United States, many towns and cities set their clocks to noon when the sun passed their local meridian, pre-corrected for the equation of time on the date of observation, to form local mean solar time. Noon occurred at different times but time differences between distant ...
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 ...
This map was obtained from an edition of the National Atlas of the United States.Like almost all works of the U.S. federal government, works from the National Atlas are in the public domain in the United States.
Daylight saving time was used again during World War II as a way to save energy for war production and later became a national standard in the U.S. in 1966 when Congress passed the Uniform Time Act.
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.
UTC−08:00 – Pacific Time zone: the Pacific coast states, the Idaho Panhandle and most of Nevada and Oregon UTC−07:00 – Mountain Time zone: most of Idaho, part of Oregon, and the Mountain states plus western parts of some adjacent states UTC−06:00 – Central Time zone: a large area spanning from the Gulf Coast to the Great Lakes