UTC was developed based on UT in 1960, officially replacing GMT seven years later (in 1967). Universal Time (UT) was established in 1884. Local time is then determined by adding (or subtracting) a specified number of hours – for example UTC+1 (time in Spain). The basic time zone is referred to as UTC. There are 40 time zones in total, with their size depending on the country borders.
Such a day therefore ends on 11.59:60 PM or 11.59:58 PM, as the case may be. When the permitted interval is exceeded, a leap second is removed (or inserted) on midnight 30 June or 31 December (whichever occurs sooner). To make sure the Coordinated Universal Time can be used in real life, it is kept within ☐.9 seconds of the Universal Time (UT1). UTC has succeeded GMT (Greenwich Mean Time) which took into account the slowing of the Earth’s rotation – this is not possible with atomic clocks. Universal Time (UT, sometimes also UT1) – a time standard based on the Earth’s rotation. utcz.zone the worldwide coordinated universal time, Coordinated Universal Time is the primary time standard by which the world regulates clocks and time.International Atomic Time (TAI) – a time defined based on the data from more than 200 atomic clocks.During the period of daylight saving time, UTC differs from the local time in London by 1 hour in winter they are identical (the local time in London shifts by one hour while UTC remains the same = they become identical). All time references within the aviation industry are indicated in relation to UTC, not the local time of the place where the time references originated.Ĭoordinated Universal Time is not adjusted for daylight saving time, and thus does not change in any manner. Prior to 1972, this time was called Greenwich Mean Time (GMT) but is now referred to as Coordinated Universal Time or Universal Time Coordinated (UTC). The aviation industry uses Coordinated Universal Time because it is the same in all of the world’s time zones, thus eliminating the need to do any time conversions when aircraft crosses time zones during flights. It is also used for defining the individual time zones. In the European Union, on the other hand, daylight saving time starts and ends at 1:00 a.m. What is Coordinated Universal Time (UTC)?Ĭoordinated Universal Time, also known as UTC or ZULU time, is the standard on which civil time is based. Prior to 1972, this time was called Greenwich Mean Time (GMT) but is now referred to as Coordinated Universal Time or Universal Time Coordinated (UTC).
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