The General Conference on Weights and Measures adopted a resolution to alter UTC with a new system that would eliminate leap seconds by 2035. This CCIR Recommendation 460 "stated that (a) carrier frequencies and time intervals should be maintained constant and should correspond to the definition of the SI second (b) step adjustments, when necessary, should be exactly 1 s to maintain approximate agreement with Universal Time (UT) and (c) standard signals should contain information on the difference between UTC and UT." This change also adopted leap seconds to simplify future adjustments. The system has been adjusted several times, including a brief period during which the time-coordination radio signals broadcast both UTC and "Stepped Atomic Time (SAT)" before a new UTC was adopted in 1970 and implemented in 1972. UTC was first officially adopted as CCIR Recommendation 374, Standard-Frequency and Time-Signal Emissions, in 1963, but the official abbreviation of UTC and the official English name of Coordinated Universal Time (along with the French equivalent) were not adopted until 1967. The coordination of time and frequency transmissions around the world began on 1 January 1960. It is effectively a successor to Greenwich Mean Time (GMT). It is within about one second of mean solar time (such as UT1) at 0° longitude (at the IERS Reference Meridian as the currently used prime meridian) and is not adjusted for daylight saving time. ![]() For other uses, see UTC (disambiguation).Ĭoordinated Universal Time or UTC is the primary time standard by which the world regulates clocks and time. For the time zone that lies between UTC−1 and UTC+1, see UTC+00:00. Since the area of the IDLW has no programmers or data centers, there is no conflict."UTC" redirects here. The IDLW is also used in software testing for time zone related code that uses system default time zone, as in some cases they may be the same as on the developer's computer. ![]() A deadline specified as "Anywhere on Earth" has not passed if, anywhere on Earth, the deadline has not passed, or, equivalently, if the deadline has not passed in the UTC–12:00 zone. Since the International Date Line West (IDLW) time zone represents the last place on Earth where a particular time and/or date exists, it is referred to as Anywhere on Earth (AoE). Instead, they keep the time and date (or just the date) of one of the neighboring zones, usually because they belong, politically, to a country which lies mostly in the neighboring time zone. UTC−12:00 is a nautical time zone comprising the high seas between 180° and 172☃0′W longitude, and the time is obtained by subtracting twelve hours from UTC.Ī number of inhabited territories lie within the longitudinal limits of this time zone ( Tonga, Wallis and Futuna and Chatham Islands as well as parts of Chukotka Autonomous Okrug of Russia, the US state of Alaska, Fiji, Tokelau and Samoa) but none of them keep the date and time of UTC−12:00. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |