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Universal Time (UT or UT1) is a time standard based on Earth's rotation. [1] While originally it was mean solar time at 0° longitude, precise measurements of the Sun are difficult. Therefore, UT1 is computed from a measure of the Earth's angle with respect to the International Celestial Reference Frame (ICRF), called the Earth Rotation Angle ...
This is an accepted version of this page This is the latest accepted revision, reviewed on 2 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 ...
This time zone is the basis of Coordinated Universal Time (UTC) and all other time zones are based on it. In ISO 8601, an example of the associated time would be written as 2069-01-01T12:12:34+00:00. It is also known by the following geographical or historical names: Greenwich Mean Time [1] Western European Time [1] Azores Summer Time [1]
Universal Time is a time scale based on the Earth's rotation, which is somewhat irregular over short periods (days up to a century), thus any time based on it cannot have an accuracy better than 1 in 10 8. However, a larger, more consistent effect has been observed over many centuries: Earth's rate of rotation is inexorably slowing down. This ...
Such designations can be ambiguous; for example, "CST" can mean China Standard Time (UTC+08:00), Cuba Standard Time (UTC−05:00), and (North American) Central Standard Time (UTC−06:00), and it is also a widely used variant of ACST (Australian Central Standard Time, UTC+9:30). Such designations predate both ISO 8601 and the internet era; in ...
Daylight saving time was used in the southern summer seasons from October 1999 to January 2002, and from November 2016 to January 2017 (written 2017). [5] UTC+13:00 was used until 2009 as a daylight time (summer in Northern Hemisphere) in the easternmost parts of Russia (Chukotka and Kamchatka) that used Kamchatka Time.
This page was last edited on 3 September 2003, at 14:46 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.
The primary time standard by which the world regulates clocks and time is UTC. It is a 24-h time standard that uses highly precise atomic clocks combined with the Earth's rotation. Timing centers around the globe agreed to keep their time scales synchronized or coordinate and hence, the name coordinated universal time.