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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.
UTC−07:00 is an identifier for a time offset from UTC of −07:00. In North America, it is observed in the Mountain Time Zone during standard time, and in the Pacific Time Zone during the other eight months (see Daylight saving time ). Some locations use it year-round.
Alaska is officially covered by two time zones - the Alaska Time Zone and the Hawaii-Aleutian Time Zone. The Hawaii-Aleutian Time Zone is used for the Aleutian Islands west of 169°30′W (Islands of Four Mountains, Andreanof Islands, Rat Islands and Near Islands), and the rest of the state uses the Alaska Time Zone.
The polar jet stream (and associated conflict zone between cold, dry air masses from Canada and warm, moist air masses from the Gulf of Mexico) drops further southward into the United States – bringing more frequent periods of stormy weather, with rain, ice and snow, and much more variable temperatures, with rapid temperature rises and falls ...
The Pacific Time Zone ( PT) is a time zone encompassing parts of western Canada, the western United States, and western Mexico. Places in this zone observe standard time by subtracting eight hours from Coordinated Universal Time ( UTC−08:00 ). During daylight saving time, a time offset of UTC−07:00 is used.
The following time zone changes occurred on 28 March 2010, which, in particular, led to abolition of two of the eleven time zones. The Udmurt Republic and Samara Oblast started using Moscow Time, thus eliminating Samara Time (MSK+1 or UTC+04:00 without DST). Kemerovo Oblast started using Omsk Time.
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 military time zone system ensures clear communication in a concise manner, and avoids confusion when coordinating across time zones. As the ACP 121 standard, [1] the military time zone system is used by the armed forces for Australia, Canada, New Zealand, the United Kingdom, the United States, and many nations in NATO .