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Most of state: UTC−06:00 CST Central Standard Time UTC−07:00 MT Nebraska Panhandle, counties with Colorado as a western boundary, and the western Sand Hills: UTC−07:00 MST Mountain Standard Time Nevada: UTC−07:00 MT Yes West Wendover city limits: UTC−07:00 MST Mountain Standard Time UTC−08:00 PT Most of state: UTC−08:00 PST ...
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 ...
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.
This is a list of the UTC time offsets, showing the difference in hours and minutes from Coordinated Universal Time (UTC), from the westernmost (−12:00) to the easternmost (+14:00). It includes countries and regions that observe them during standard time or year-round.
Standard time is the synchronization of clocks within a geographical region to a single time standard, rather than a local mean time standard. Generally, standard time agrees with the local mean time at some meridian that passes through the region, often near the centre of the region.
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.
Local mean time (LMT) is a form of solar time that corrects the variations of local apparent time, forming a uniform time scale at a specific longitude. This measurement of time was used for everyday use during the 19th century before time zones were introduced beginning in the late 19th century; it still has some uses in astronomy and navigation.
During World War II between February 9, 1942 and September 30, 1945, Hawaiian Standard Time was advanced one hour to so-called Hawaiian War Time, effectively placing the territory on year-round daylight saving time. [67] In both cases where DST was used, Hawaii used UTC−09:30 during DST as standard time was 30 minutes behind.