what is universal time and greenwich mean time
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Universal Time (UT) is a time standard based on Earth's rotation. There are several versions of Universal Time, which differ by up to a few seconds. ... UTC is based on International Atomic Time, with leap seconds added to keep it within 0.9 second of UT1.
Greenwich Mean Time is the mean solar time at the Royal Observatory in Greenwich, London, reckoned from midnight. At different times in the past, it has been calculated in different ways, including being calculated from noon; as a consequence, it cannot be used to specify a precise time unless a context is given.
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universal time standard time and Greenwich time is official time zone
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