On 3 Jan 2017, at 20:10, Joe Touch wrote: > They nearly universally use UTC, which is managed by the ITU. UTC is managed by BIPM in Paris, based on the Metre Convention. The governance of BIPM can be found here: <http://www.bipm.org/en/about-us/governance/> Leap seconds are defined by ITU-R, and decided upon by International Earth Rotation and Reference Systems Service (IERS). <https://www.iers.org/> And possibly more pieces of the puzzle are needed. So, "its complicated". ;-) Patrik
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