This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. Find sources: "Civil time" – news · newspapers · books · scholar · JSTOR(July 2015) (Learn how and when to remove this message)
In modern usage, civil time refers to statutory time as designated by civilian authorities. Modern civil time is generally national standard time in a time zone at a fixed offset from Coordinated Universal Time (UTC), possibly adjusted by daylight saving time during part of the year. UTC is calculated by reference to atomic clocks and was adopted in 1972.[1] Older systems use telescope observations.
In traditional astronomical usage, civil time was mean solar time reckoned from midnight. Before 1925, the astronomical time 00:00:00 meant noon, twelve hours after the civil time 00:00:00 which meant midnight. HM Nautical Almanac Office in the United Kingdom used Greenwich Mean Time (GMT) for both conventions, leading to ambiguity[clarification needed], whereas the Nautical Almanac Office at the United States Naval Observatory used GMT for the pre-1925 convention and Greenwich Civil Time (GCT) for the post-1924 convention until 1952. In 1928, the International Astronomical Union introduced the term Universal Time for GMT beginning at midnight.[2]
In modern usage, GMT is no longer a formal standard reference time: it is now a name for the time zone UTC+00:00. Universal Time is now determined by reference to distant celestial objects: UTC is derived from International Atomic Time (TAI), and is adjusted by leap seconds to compensate for variations in the rotational velocity of the Earth.[3] Civil Times around the world are all defined by reference to UTC. [In many jurisdictions, legislation has not been updated and still refers to GMT: this is taken to mean UTC+0.]
^"Coordinated Universal Time (UTC) (CCTF/09-32)" (PDF). Bureau International des Poids et Mesures. p. 3. Retrieved 5 October 2022.
^McCarthy, Dennis D.; Seidelmann, P. Kenneth (2009). Time : from Earth rotation to atomic physics. P. Kenneth Seidelmann. Weinheim: Wiley-VCH. p. 17. ISBN 978-3-527-40780-4. OCLC 429605165.
^"Standard-frequency and time-signal emissions" (PDF). Coordinated universal time (UTC). Rec. ITU-R TF.460-6.
usage, civiltime refers to statutory time as designated by civilian authorities. Modern civiltime is generally national standard time in a time zone at...
establishes a reference for the current time, forming the basis for civiltime and time zones. UTC facilitates international communication, navigation, scientific...
time unless a context is given. The term GMT is also used as one of the names for the time zone UTC+00:00 and, in UK law, is the basis for civiltime...
Australia uses three main time zones: Australian Eastern Standard Time (AEST; UTC+10:00), Australian Central Standard Time (ACST; UTC+09:30) and Australian...
combination of the time zone and daylight saving rules, along with the timekeeping services, which determines the legal civiltime for any U.S. location...
pseudo-Unix-time representation. This resembles the manner in which time zone tables must be consulted to convert to and from civiltime; the IANA time zone...
British Summer Time (BST), civiltime in the United Kingdom is advanced one hour forward of Greenwich Mean Time (GMT), in effect changing the time zone from...
The American Civil War (April 12, 1861 – May 26, 1865; also known by other names) was a civil war in the United States between the Union ("the North")...
Civil Aviation Timor-Leste is a government organization, part of the Department of Transport & Communications in the Ministry of Transport and Communications...
the smallest time value in the representation. The standard uses the Gregorian calendar, which "serves as an international standard for civil use." ISO 8601:2004...
to specify the local solar time (which may not be the current civiltime, whether it is standard time or daylight saving time). Several regions of the world...
precise time signal based on UTC time. The surface of the Earth is split into a number of time zones. Standard time or civiltime in a time zone deviates...
kind of time standard can be a time scale, specifying a method for measuring divisions of time. A standard for civiltime can specify both time intervals...
Love in the Time of Civil War (French: L'amour au temps de la guerre civile) is a 2014 Canadian drama film directed by Rodrigue Jean. It was selected...
slowing ever so slightly, a leap second is added at irregular intervals to civiltime to keep clocks in sync with Earth's rotation. Analog clocks and watches...
unlike civiltime in Switzerland and many other countries, Swatch Internet Time does not observe daylight saving time (DST). Swatch Internet Time was announced...
Civil engineering is a professional engineering discipline that deals with the design, construction, and maintenance of the physical and naturally built...
civiltime generally follows UTC. In some countries, the term Greenwich Mean Time persists in common usage to this day in reference to UT1, in civil timekeeping...
mainland's single time zone, which approximates solar time in the capital, Juneau, leads to a large disparity between civiltime and solar time for much of...
Telstra Caesium beam frequency standards. Ged Company built civiltime receivers. The civiltime code generators and two tone generators were designed and...
timekeeping and as the reference for civiltime in most countries, uses TAI and consequently would run ahead of observed solar time unless it is reset to UT1 as...
local time. If a precise moment for the genuine "midnight sun" is required, the observer's longitude, the local civiltime, and the equation of time must...
influenced by the equation of time. Civiltime is the local mean time for a meridian that often passes near the center of the time zone, and may possibly be...
zones. With current technology, most modern computers keep track of local civiltime, as do many other household and personal devices such as VCRs, DVRs, cable...
short period of time, African-American men voted and held political office, but as time went on Blacks were increasingly deprived of civil rights, often...
Global Information