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The US Congress establishes time zones and approves daylight saving time.
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United States Congress
Bicameral legislature of the United States
The United States Congress is the legislative branch of the federal government of the United States. It is a bicameral legislature, including a lower body, the U.S. House of Representatives, and an upper body, the U.S. Senate. They both meet in the United States Capitol in…Source: Wikipedia (CC BY-SA)
Standard Time Act
United States time zone and Daylight Saving Time law
The Standard Time Act of 1918, also known as the Calder Act, was the first United States federal law implementing Standard time and Daylight saving time in the United States. It defined five time zones for the continental United States and authorized the Interstate Commerce…Source: Wikipedia (CC BY-SA)
Time zone
Area that observes a uniform standard time
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…Source: Wikipedia (CC BY-SA)
Daylight saving time
Seasonal change of clock settings
Daylight saving time (DST), also referred to as daylight savings time, daylight time, or summer time, is the practice of advancing clocks to make better use of the longer daylight available during summer so that darkness falls at a later clock time. The standard implementation…Source: Wikipedia (CC BY-SA)