![]() It replaced the Greenwich Mean Time (GMT) in. The Greenwich time zone runs fromħ.5°W to 7.5☎ longitude, while zone A runs from 7.5☎ to 22.5☎ longitude, etc. The official time standard regulating the worlds time and clocks is called Coordinated Universal Time (UTC). These were to be vocalized using a phoneticĪlphabet which pronounces the letter Z as Zulu, leading sometimes to It is within about one second of mean solar. To the west (J may be assigned to local time in non-nauticalĪpplications zones M and Y have the same clock time but differ by 24 Coordinated Universal Time or UTC is the primary time standard by which the world regulates clocks and time. However, since it is primarily used as a reference time, it doesn't matter what area of Earth it applies to as long as everyone uses the same reference.Īround 1950, a letter suffix was added to the zone description,Īssigning Z to the zero zone, and A–M (except J) to the east and N–Y ahead of UTC (Coordinated Universal Time). Technically, because the definition of nautical time zones is based on longitudinal position, the Z time is not exactly identical to the actual GMT time 'zone'. UTC (Coordinated Universal Time) is one of the well-known names of UTC+0 time zone which is 0h. "Zulu", UTC is sometimes known as Zulu time. Since the NATO phonetic alphabet and amateur radio word for Z is To obtain your local time here in the United States, you need to subtract a certain number of hours from UTC depending on how many time zones you are away from Greenwich (England). Utc was formerly used as the international civil time. It is also known as 'Z time' or 'Zulu Time'. Greenwich Mean Time (GMT) is the mean solar time at the Royal Observatory in Greenwich, London. Zero hours, which has been used since 1920 (see time zone history). It is a coordinated time scale, maintained by the Bureau International des Poids et Mesures (BIPM). UTC is commonly referred to as International Time, Universal Time (UT), Zulu Time (U.S. The letter also refers to the "zone description" of ![]() The standard before was Greenwich Mean Time (GMT). It is, within about 1 second, mean solar time at 0 longitude. It is the standard by which the world regulates clocks and time. The equivalent nautical time zone (GMT), which has been denoted by a Z Coordinated Universal Time (or UTC) is the standard time system of the world. The UTC time zone is sometimes denoted by the letter Z-a reference to 'Z' stands for Zulu time, which is also GMT and UTC. ![]()
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