[tz] JavaScript IANA date/time library, now with support for leap seconds, TAI, TDT

Tue Apr 27 00:07:48 UTC 2021

On Mon, 26 Apr 2021 15:06:12 -0600, Paul Gilmartin <PaulGBoulder at aim.com> wrote:
>> POSIX time is really just UTC without the leap seconds, isn?t it?
>> 
> More precisely, POSIX time counts non-leap seconds since 1972-01-01t00:00:00 UTC.

That would be 1970-01-01T00:00:00 UTC. 1972 is, however, the year that the first official leap second (for POSIX not to count) occurred.