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Map of U.S. time zones with new CST and EST areas displayed. 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.
If present, a dagger (†) indicates the usage of a nautical time zone letter outside of the standard geographic definition of that time zone. Some zones that are north/south of each other in the mid Pacific differ by 24 hours in time – they have the same time of day but dates that are one day apart. The two extreme time zones on Earth (both ...
Two states are fully contained in the Pacific Time Zone: [3] California; Washington; Three states are split between the Pacific Time Zone and the Mountain Time Zone: [3] Idaho – 10 counties in the Idaho Panhandle north of Hells Canyon and the Salmon River are in the Pacific Time Zone [4] due to proximity to cities in Washington [5] [6]
Operators of the new railroad lines needed a new time plan that would offer a uniform train schedule for departures and arrivals. Four standard time zones for the continental United States were introduced at noon on November 18, 1883, in Chicago, IL, when the telegraph lines transmitted time signals to all major cities. [4] [5]
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.
The Oregon legislation states that the part of Oregon in the Pacific Time Zone would stop "the one-hour change of time in the spring and fall of each year" keeping the zone standard time year-round.
U.S. time zones (some U.S. time zones are not on this map) UTC−12:00 (Baker Island, Howland Island) Samoa Time Zone (American Samoa, Jarvis Island, Kingman Reef, Midway Atoll, Palmyra Atoll) Hawaii–Aleutian Time Zone (Hawaii, Aleutian Islands (Alaska), Johnston Atoll) Alaska Time Zone (Alaska, excluding Aleutian Islands) Pacific Time Zone
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.