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    Does this answer your question? Leap seconds and date Commented Oct 14, 2023 at 16:20
  • @MarcusMüller so it starts from "00:00:00 UTC on Thursday, 1 January 1970" but not working as UTC? I am now confused, then what is the difference between TAI and Unix time? just the epoch? Commented Oct 14, 2023 at 16:28
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    UTC is something completely different altogether: It defines what time it is – not just how many seconds since some common event. "It's fourteen million two hundred thousand twenty six seconds since epoch" is less useful than saying "it's 9:12 in the morning here, and today's the sixth of June", for example, in many cases. Commented Oct 14, 2023 at 16:35
  • Related: unix.stackexchange.com/q/283164/88378 Astronomer Steve Allen has a lot of info on this topic, eg ucolick.org/~sla/leapsecs/picktwo.html & ucolick.org/~sla/leapsecs/epochtime.html Commented Oct 16, 2023 at 10:21