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The Eastern Time Zone (ET) is a time zone encompassing part or all of 23 states in the eastern part of the United States, parts of eastern Canada, and the state of Quintana Roo in Mexico. Eastern Standard Time ( EST ) is five hours behind Coordinated Universal Time ( UTC−05:00 ).
Affiliates in the Mountain, Alaskan, and Hawaiian zones are either on their own to delay broadcast by an hour or two, or collectively form a small, regional network feed with others in the same time zone. Prime time is commonly defined as 8:00–11:00 p.m. Eastern/Pacific and 7:00–10:00 p.m. Central/Mountain.
This is an accepted version of this page This is the latest accepted revision, reviewed on 17 January 2025. Primary time standard "UTC" redirects here. For the time zone between UTC−1 and UTC+1, see UTC+00:00. For other uses, see UTC (disambiguation). It has been suggested that UTC offset be merged into this article. (Discuss) Proposed since December 2024. Current time zones Coordinated ...
Standard time zones of the world. The number at the bottom of each zone specifies the number of hours to add to UTC to convert it to the local time. As international commerce increased, the need for an international standard of time measurement emerged. Several authors proposed a "universal" or "cosmic" time (see Time zone § Worldwide time zones).
World map of current time zones. A time zone is a geographical region in which residents observe the same standard time.Although nominally a new time zone is established every 15 degrees east or west of the prime meridian (meaning a one-hour change in the time), in practice local geographical or political considerations may vary its application.
The year 1950 was chosen because it was the standard astronomical epoch at that time. [ citation needed ] It also marked [ 3 ] the publication of the first radiocarbon dates in December 1949, [ 17 ] and 1950 also antedates large-scale atmospheric testing of nuclear weapons , which altered the global ratio of carbon-14 to carbon-12 .
Heron Island, 72 km (45 mi) off the coast off Gladstone in Queensland, has two time zones: the island resort follows DST all year round, whereas the Marine Research Centre and the Parks and Wildlife office on the island remain on Eastern Standard Time. Resort manager Alistair Cooray says no-one is sure how the time zone came about.
USCGC – United States Coast Guard Cutter; USMA – United States Military Academy (U.S. Army) at West Point, New York; USMC – United States Marine Corps; USN – United States Navy; USNA – United States Naval Academy (U.S. Navy) at Annapolis, Maryland; USO – United Service Organizations (U.S. Military) USR – Unit Status Report