Re: [tz] JavaScript IANA date/time library, now with support for leap seconds, TAI, TDT
On Mon, 26 Apr 2021 15:06:12 -0600, Paul Gilmartin <PaulGBoulder@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.
On 2021-04-26, at 20:07, Kerry Shetline <kerry@shetline.com> wrote:
On Mon, 26 Apr 2021 15:06:12 -0600, Paul Gilmartin <PaulGBoulder@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.
Well, OK… to correct my correction... I see that official UTC didn’t start until 1972, but POSIX time is 0 seconds at 1970-01-01, which I suppose works as a kind of proleptic UTC. I tend not to think of a count as “starting” at 63,072,010. :-)
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Kerry Shetline