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He missed to explain TAI and its relation with the other times.

Also, there have been many definitions of UTC, GMT etc over time. So to be truly correct you'd always have to mention which definition of UTC you are referring to when you use the term. And the ITU-R is debating to redefine UTC once again and remove leap seconds (http://www.ucolick.org/~sla/leapsecs/). If you are really interesting in the time stuff, here is a great resource: http://www.ucolick.org/~sla/.


>mention which definition of UTC you are referring to

Doesn't the time value tell you? Or have there been temporally overlapping definitions of UTC that disagreed?


There have been many defintions of UTC http://www.ucolick.org/~sla/leapsecs/timescales.html#UTC which do not agree. When an API does not match what the providers supply, which definition qualifies as "official"?


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