![]() The geographically correct position is about 100 meters further east. In the courtyard of the historic Royal Greenwich Observatory, a brass strip and a laser beam symbolize the zero meridian. Previously, numerous coordinate systems competed with each other. Time Zones and Units UTC US Eastern Standard Time (EST) + 5 hours or UTC US Pacific Standard Time (PST) + 8 hours UTC EDT + 4 hours UTC PDT + 7 hours. Only with this worldwide uniform regulation did the coordinates we know today exist. UTC is the universal standard time coordinated through international agreement. When the date line was established in a preferably uninhabited area between Asia and America, the zero meridian was established on the opposite side of the globe in Greenwich. What is UTC (Coordinated Universal Time). Each section of 15° corresponded to one hour, which, at least in theory, resulted in 24 uniform time zones. ![]() It was not until 1884 that a globally uniform time system was agreed upon, dividing the globe into 24 equal-sized areas according to their longitudes. One of the best known was already based on the Greenwich meridian. For example, the offset for Moscow is UTC+3. The time zone controls the offset from UTC that is the equivalent of the local time. UTC is the primary time standard by which the world regulates clocks and time. Origin of the Greenwich Mean Time During seafaring times, there were different zero meridians and systems for position calculation depending on the nation. The utcdatetime data type stores time and date data in a single field in Coordinated Universal Time (UTC). GMT is the name of the time zone, while UTC is a term for a time system that also has its normal state on the zero meridian. Current UTC, Time Zone (Coordinated Universal Time) Greenwich Mean Time (GMT) Zulu Military Time 0 (Prime Meridian) Longitudes between 7.5 West and 7.5. The different designation of the same time zone often leads to confusion. ![]() It corresponds to Western European time, which is valid in Portugal, for example, but is officially referred to as GMT in the United Kingdom and several African countries. The Greenwich Mean Time corresponds to the UTC 0 time zone, i.e., the Coordinated World Time with an offset of 0 hours. ![]() For Greenwich Mean Time, the time zone UTC +0 applies. Most parts of Central Europe are in the UTC +1 time zone. GMT and UTC - Coordinated World Time The differences between the individual time zones are always given in relation to the "Universal Time Coordinated" (UTC), i.e., the time that exists on the zero meridian (zero longitude). Saint Helena, Ascension and Tristan da Cunha ![]()
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