For sub-microsecond precision, clients can obtain the time from satellite signals. If only milliseconds precision is needed, clients can obtain the current UTC from a number of official internet UTC servers. The Network Time Protocol (NTP), designed to synchronise the clocks of computers over the Internet, transmits time information from the UTC system. UTC is used in many Internet and World Wide Web standards. In 1995, the island nation of Kiribati moved those of its atolls in the Line Islands from UTC−10 to UTC+14 so that Kiribati would all be on the same day. The westernmost time zone uses UTC−12, being twelve hours behind UTC the easternmost time zone uses UTC+14, being fourteen hours ahead of UTC. Time zones around the world are expressed using positive or negative offsets from UTC, as in the list of time zones by UTC offset. The name "Coordinated Universal Time (UTC)" was approved by a resolution of IAU Commissions 4 and 31 at the 13th General Assembly in 1967 (Trans. In 1967 the CCIR adopted the names Coordinated Universal Time and Temps Universel Coordonné for the English and French names with the acronym UTC to be used in both languages. ![]() McCarthy described the origin of the abbreviation: The compromise that emerged was UTC, which conforms to the pattern for the abbreviations of the variants of Universal Time (UT0, UT1, UT2, UT1R, etc.). This abbreviation comes as a result of the International Telecommunication Union and the International Astronomical Union wanting to use the same abbreviation in all languages. The official abbreviation for Coordinated Universal Time is UTC. The General Conference on Weights and Measures adopted a resolution to alter UTC with a new system that would eliminate leap seconds by 2035. Recent years have seen significant developments in the realm of UTC, particularly in discussions about eliminating leap seconds from the timekeeping system because leap seconds occasionally disrupt timekeeping systems worldwide. Since adoption, UTC has been adjusted several times, notably adding leap seconds in 1972. The current version of UTC is defined by the International Telecommunication Union. UTC was first officially adopted as a standard in 1963 and "UTC" became the official abbreviation of Coordinated Universal Time in 1967. The coordination of time and frequency transmissions around the world began on 1 January 1960. UTC is within about one second of mean solar time at 0° longitude, the currently used prime meridian, and is not adjusted for daylight saving time. UTC is based on TAI, which is a weighted average of hundreds of atomic clocks worldwide. ![]() In specialized domains such as scientific research, navigation, and timekeeping, other standards such as UT1 and International Atomic Time (TAI) are also used alongside UTC. UTC has been widely embraced by most countries and is the effective successor to Greenwich Mean Time (GMT) in everyday usage and common applications. UTC facilitates international communication, navigation, scientific research, and commerce. It establishes a reference for the current time, forming the basis for civil time and time zones. For other uses, see UTC (disambiguation).Ĭoordinated Universal Time or UTC is the primary time standard globally used to regulate clocks and time. For the time zone that lies between UTC−1 and UTC+1, see UTC+00:00.
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