Today, Greenwich Mean Time (GMT) is only the name of a time zone that is used by a few countries in Africa and Western Europe, including the UK during winter and all year in Iceland. If you want to reach out to someone in London and you are available anytime, you can schedule a call. In London, this will be a usual working time of between 10:00 am and 6:00 pm. Since then, GMT is no longer a time standard. If you are in UTC, the most convenient time to accommodate all parties is between 9:00 am and 5:00 pm for a conference call or meeting. Until 1972, Greenwich Mean Time (also known as Zulu time) was the same as Universal Time (UT). UTC was adjusted several times until 1972, when leap seconds were introduced to keep UTC in line with the Earth's rotation, which is not entirely even, and less exact than atomic clocks. The name Coordinated Universal Time was officially adopted in 1967. In 1960, the International Radio Consultative Committee formalized the concept of UTC, and it was put into practice the year after. The transit circle is a part of the telescope's mechanics and it is still cited as the prime meridian's original reference (0° longitude). The reference line or starting point, the Prime Meridian, was determined to be the transit circle at the Royal Observatory in Greenwich, London. This is the basis for the 24-hour time zone system we know today.Īt the time, Greenwich Mean Time (GMT) was chosen as the world’s time standard. Universal Time (UT) was created at the International Meridian Conference in 1884. It is used to compare the pace provided by TAI with the actual length of a day on Earth. Universal Time (UT1): Also known as astronomical time or solar time, it refers to the Earth's rotation.International Atomic Time (TAI): A time scale that combines the output of some 400 highly precise atomic clocks worldwide, and provides the exact speed for our clocks to tick. Two components are used to determine UTC: The world's timing centers have agreed to keep their time scales closely synchronized - or coordinated - therefore the name Coordinated Universal Time. UTC is the time standard commonly used across the world. ©/stocknshares A Standard, Not a Time Zone The Greenwich Meridian in London, England. Business Date to Date (exclude holidays).You'll be able to see the time difference - in hours and minutes - between the different territories and Coordinated Universal Time (UTC). This list provides the UTC time offsets from the western to eastern-most time zones. Today, Greenwich Mean Time is not considered a standard anymore yet it is the label of one of the 24 total time zones on Earth, used by countries in Africa, Western Europe and the UK (during the winter season). Just a year later, in 1967, it was officially adopted as the primary timekeeping standard. However, it wasn't until 1960, that the International Radio Consultative Committee came up with the concept of Coordinated Universal Time. This is when the idea of a 24-hour time zone - a concept we currently use - came into fruition and became adopted widely.īefore that time, Greenwich Mean Time or GMT was actually the world standard. Universal Time was actually created during the Washington Meridian Conference held in 1884. Thanks to these two elements UTC is used to synchronize clocks in various countries all over the world, across 24 different time zones. It is what timekeepers use to measure the length of a single day on the planet. Because of that fact, it is also sometimes called astronomical or solar time. UT1 or Universal Time is determined by the Earth's rotation. It is found by combining the time of more than 200 atomic clocks located worldwide. TAI or International Atomic Time is a scale that helps determine the speed at which clocks should tick. Those are the International Atomic Time and Universal Time. There are actually two main components to the Universal Coordinated Time standard. Other time zones are designated by the hourly difference between Coordinated Universal Time. World timing centers across the globe have decided to keep their local clocks synchronized with the UTC standard. Contrary to popular belief, UTC is a standard even though it is mistaken for a time zone, which it is not. Did you know that UTC actually stands for Coordinated Universal Time? How about the fact that Universal Time was created in 1884?Ĭoordinated Universal Time is named as such because it is the standard by which all time zones are based.
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