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An [Acronym] for __T__emps __A__tomique __I__nternational, ie International Atomic Time. This is a time zone measured with atomic clocks. Its reading increases monotonically, without leap seconds added. [TAI] is defined as the unit of duration of 9,192,631,770 cycles of radiation corresponding to the transition between two hyperfine levels of the ground state of Caesium 133. [TAI] was exactly 31s ahead of [UTC] on Jul 01, 1997. There were no leap seconds on that day. Compare [GMT], [UTC].
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TAI
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UTC
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