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UTC−4 é a diferença de fuso horário que subtrai quatro horas do Tempo Universal Coordenado (UTC); isto é, a hora local padrão e de verão neste fuso [ 1] é de menos quatro horas em relação ao Meridiano de Greenwich . Longitude ao meio: 60º 00' 00" O. No Brasil, este fuso horário foi usado no oeste do estado do Pará ...
Time in Brazil, since 25 April 2019. UTC−04:00 is an identifier for a time offset from UTC of −04:00. It is observed in the Eastern Time Zone (e.g., in Canada and the United States) during the warm months of daylight saving time, as Eastern Daylight Time.
UTC−4:30. UTC - 4:30 ou Horário de Caracas foram os nomes oficiais do fuso horário adotado pela Venezuela, onde o horário local era contado a partir de menos quatro horas e trinta minutos do horário do Meridiano de Greenwich. Este fuso horário foi utilizado somente pelo país, mas em 1º de maio de 2016 adotou novamente o fuso ...
UTC−6. UTC−6 (horário da Cidade do México ou CST - Central Standard Time) é um fuso horário onde a hora local de seus países usuários é contada a partir de menos seis horas do horário do Tempo Universal Coordenado . Longitude ao meio: 90º 00' 00" O. Este fuso horário é usado como tempo padrão por: Belize. Canadá [ 1]
- Etymology
- Uses
- Mechanism
- History
- Rationale
- Future
- See Also
- External Links
The official abbreviation for Coordinated Universal Time is UTC. 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 compromise that emerged was UTC,which conforms to the pattern for the abbreviations of the variants of U...
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 westernmost time zone uses UTC−12, being twelve hours behind UTC; the easternmost time zone uses UTC+14, being fourteen hours ahead of UTC. In 1995, the island nation of Kiribati moved those of its atolls in the Lin...
UTC divides time into days, hours, minutes, and seconds. Days are conventionally identified using the Gregorian calendar, but Julian day numbers can also be used. Each day contains 24 hours and each hour contains 60 minutes. The number of seconds in a minute is usually 60, but with an occasional leap second, it may be 61 or 59 instead. Thus, in the...
In 1928, the term Universal Time (UT) was introduced by the International Astronomical Union to refer to GMT, with the day starting at midnight. Until the 1950s, broadcast time signalswere based on UT, and hence on the rotation of the Earth. In 1955, the caesium atomic clock was invented. This provided a form of timekeeping that was both more stabl...
Earth's rotational speed is very slowly decreasing because of tidal deceleration; this increases the length of the mean solar day. The length of the SI second was calibrated on the basis of the second of ephemeris time and can now be seen to have a relationship with the mean solar day observed between 1750 and 1892, analysed by Simon Newcomb. As a ...
As the Earth's rotation continues to slow, positive leap seconds will be required more frequently. The long-term rate of change of LOD is approximately +1.7 ms per century. At the end of the 21st century, LOD will be roughly 86,400.004 s, requiring leap seconds every 250 days. Over several centuries, the frequency of leap seconds will become proble...
CurrentUTC timeW3C Specification about UTC Date and Time and RFC 3339, based on ISO 8601UTC−2:00 é a diferença de fuso horário que subtrai duas horas do Tempo Universal Coordenado; isto é, a hora local padrão e de verão neste fuso (para regiões que adotam UTC -3:00 como padrão, e aderem ao horário de verão), [1] é de menos duas horas em relação ao Meridiano de Greenwich.
Contents. hide. (Top) UTC−12:00, Y. UTC−11:00, X. UTC−10:00, W. UTC−09:30, V†. UTC−09:00, V. UTC−08:00, U. UTC−07:00, T. UTC−06:00, S. UTC−05:00, R. UTC−04:00, Q. UTC−03:30, P†. UTC−03:00, P. UTC−02:00, O. UTC−01:00, N. UTC±00:00, Z. UTC+01:00, A. UTC+02:00, B. UTC+03:00, C. UTC+03:30, C†. UTC+04:00, D. UTC+04:30, D†. UTC+05:00, E. UTC+05:30, E†.
