![]() ![]() ![]() Time zones play a crucial role in organizing daily life across the vast expanse of the United States. Below there are some words you may find helpful. They ensure that, for example, when it's 12:00 p.m. Time zones help coordinate daily life, business activities, and travel. World Clock : a clock displaying the time for various cities around the world, usually found in locations such as airports and global business centers it helps travelers and businesses coordinate across different time zones.Local Time : the time observed within a specific region or locale, based on the corresponding time zone or any other local custom.Meridian : an imaginary line on the Earth's surface from the North Pole to the South Pole time zones are defined by meridians.Greenwich Mean Time (GMT) : often used interchangeably with UTC however, GMT is a time system originally referring to mean solar time at the Royal Observatory in Greenwich, London.UTC (Coordinated Universal Time) : the primary time standard by which the world regulates clocks and time it's not adjusted for Daylight Saving Time and is sometimes referred to as "Zulu time.".Daylight Saving Time : a practice of setting the clock ahead by one hour during warmer months this helps to extend evening daylight and save energy resources.Standard Time : the specific time within a time zone often different from the actual solar time.Longitude : an east-west measurement of position on the Earth it's the basis for time zones.Here are some terms related to time zones: They are necessary because the Earth is divided into 24 sections each section represents one hour of time. Understanding Time ZonesĪ time zone is a region where the same standard time is observed. This article will help you understand these time zones, how they work, and why they are important for everyday life. In the United States, there are six main time zones. OversightĭOT is responsible for fostering and promoting uniform time observance.Time zones are regions where the same standard time is used. The time zones established by the Standard Time Act, as amended by the Uniform Time Act, are Atlantic, eastern, central, mountain, Pacific, Alaska, Hawaii–Aleutian, Samoa, and Chamorro. §§ 260-64) establishes a system of uniform Daylight Saving Time throughout the Nation and its possessions, and provides that either Congress or the Secretary of Transportation can change a time-zone boundary. Today, the Uniform Time Act of 1966 (15 U.S.C. This responsibility was transferred from the Interstate Commerce Commission to DOT when Congress created DOT in 1966. Local decisions on which time zone to adopt were usually influenced by the time used by the railroads.įederal oversight of time zones began in 1918 with the enactment of the Standard Time Act, which vested the Interstate Commerce Commission with the responsibility for establishing boundaries between the standard time zones in the continental United States. States and municipalities then adopted one of the four zones, which were the eastern, central, mountain, and Pacific Time zones. and Canadian railroads adopted a four-zone system to govern their operations and reduce the confusion resulting from some 100 conflicting locally established “sun times” observed in terminals across the country. States do not have the authority to choose to be on permanent Daylight Saving Time. ![]() Under the Uniform Time Act, States may choose to exempt themselves from observing Daylight Saving Time by State law. If a State chooses to observe Daylight Saving Time, it must begin and end on federally mandated dates. Nor does DOT have any role to play in a State's determination whether to observe Daylight Saving Time. DOT regulations at 49 CFR part 71 contain the official listing of the Nation's time zones.ĭOT also oversees the Nation's uniform observance of Daylight Saving Time however, DOT does not have the power to repeal or change Daylight Saving Time. The oversight of time zones was assigned to DOT because time standards are important for many modes of transportation. Department of Transportation (DOT) oversees the Nation's time zones. ![]()
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