§260: Navassa Island, Bajo Nuevo Bank, Serranilla BankĪlabama, Arkansas, Chicago, Iowa, Louisiana, Minnesota, Mississippi, Missouri, Oklahoma, Wisconsin Partially: Florida, Indiana, Kansas, Kentucky, Michigan, Nebraska, North Dakota, South Dakota, Tennessee, TexasĪrizona (no DST outside of Navajo Nation), Colorado, Montana, New Mexico, Utah, Wyoming Partially: Idaho, Kansas, Nebraska, North Dakota, Oregon, South Dakota, TexasĬalifornia, Nevada, Washington (state) Partially: Idaho, Oregon law they are:Ĭonnecticut, Delaware, District of Columbia, Georgia, Maine, Maryland, Massachusetts, New Hampshire, New Jersey, New York, North Carolina, Ohio, Pennsylvania, Rhode Island, South Carolina, Vermont, Virginia, West Virginia Partially: Florida, Indiana, Kentucky, Michigan, Tennessee No DST observed, not defined by 15 U.S.C. The United States of America and its surrounding areas use 9 standard time zones. Also, these abbreviations can be the same as those used in other parts of the world for different time zones. The shorter abbreviations we often use are just for convenience and are not official. The official names of the time zones are what's used in laws and official documents. Before this, they were based on the solar time at different longitudes west of Greenwich, UK. Since August 9, 2007, these time zones are defined by how many hours they are ahead of or behind Coordinated Universal Time (UTC). The Secretary of Transportation has the power to decide which time zones different regions will use and whether they'll follow daylight saving time. This law decides when daylight saving time starts and ends, if it's used. In the United States, standard time zones and the rules for daylight saving time are set by federal law (15 USC §260). United States Maps in our Store - Order High Resolution Vector and Raster Files It is the mix of the time zone and DST rules, along with the timekeeping services, which calculate the legal civil time for any United States location at any moment. The clocks managed by these services are kept in synchronization with each other as well as with those of other internationally recognized timekeeping organizations. Official and extremely precise timekeeping services (clocks) are presented by 2 federal agencies: NIST (the National Institute of Standards and Technology) (an agency of the Department of Commerce) and UNSO (the United States Naval Observatory). The time zone boundaries and daylight saving time observance are organized by the Department of Transportation. observing DST (daylight saving time) for generally the spring, summer, and fall months. In a few regions, however, the legal time kept is not that of one of the 24 standard time zones because half-hour or quarter-hour differences are in effect there.Explore US time zone map, Time in the United States of America, by law, is divided into 9 standard time zones covering the American states, territories and other U.S. Time is the same throughout each zone and differs from the international basis of legal and scientific time, Greenwich Mean Time (GMT) or Coordinated Universal Time (UTC), by an integral number of hours minutes and seconds are the same. These meridians are theoretically the centres of 24 standard time zones in practice, the zones have in many cases been subdivided or altered in shape for the convenience of inhabitants. The present system employs 24 standard meridians of longitude (lines running from the North Pole to the South, at right angles to the Equator) 15º apart, starting with the prime meridian through Greenwich, England. Following this initiative, in 1884 delegates from 27 nations met in Washington, D.C., for the MeridianĬonference and agreed on a system basically the same as that now in use. Sir Sandford Fleming, a Canadian railway planner and engineer, outlined a plan for worldwide standard time in the late 1870s. The need for a standard time was felt most particularly in the United States and Canada, where several extensive railway routes passed through places that differed by several hours in local time. Some such standard became increasingly necessary with the development of rapid railway systems and the consequent confusion of schedules that used scores of different local times kept in separate communities (local time varies continuously with change in longitude). The concept of standard time was adopted in the late 19th century in an attempt to end the confusion that was caused by each community's use of its own solar time. The whole of China, one of the largest countries in the world, has decided to adopt a single time zone. Standard time the time of a town, region or country that is established by law or
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