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"Federal 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 ...
The tz database partitions the world into regions where local clocks all show the same time. This map was made by combining version 2023d with OpenStreetMap data, using open source software. [1] This is a list of time zones from release 2025a of the tz database. [2]
Prepare yourself emotionally: You are about to lose an hour of sleep overnight. Daylight saving time starts at 2 a.m. on March 10, 2024, the second Sunday of March.
Daylight saving 2024 ends the this weekend! The time change will fall back an hour for participating U.S. states. Here's when to turn your clocks for DST.
From east to west, the four time zones of the contiguous United States are: Eastern Time Zone (Zone R), which comprises roughly the states on the Atlantic coast and the eastern two thirds of the Ohio Valley. Central Time Zone (Zone S), which comprises roughly the Gulf Coast, Mississippi Valley, and most of the Great Plains.
Many states subsequently introduced daylight saving time, and in 1966, the Uniform Time Act standardized the dates when it begins and ends. [3] Hawaii, most of Arizona, and the U.S. territories have opted to observe permanent standard time, [4] but the Uniform Time Act forbids observation of permanent daylight saving time. [3]
Daylight saving time will end for the year at 2 a.m. local time on Sunday, Nov. 3, when we "fall back" and gain an extra hour of sleep. Next year, it will begin again on Sunday, March 9, 2025 ...
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.