Thanks for that info. "Us" there means: "Founded in 1982 by the major space agencies of the world, the CCSDS is a multi-national forum for the development of c

Thanks for that info. "Us" there means: "Founded in 1982 by the major space agencies of the world, the CCSDS is a multi-national forum for the development of communications and data systems standards for spaceflight." And indeed, the epoch: "The CCSDS-Recommended epoch is that of 1958 January 1 (TAI) and the recommended time unit is the second, using TAI as reference time scale, for use as a level 1 time code. This time code is not UTC-based and leap-second corrections do not apply."