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

[John Sauter]

On Mon, 2021-04-26 at 23:57 +0100, Tony Finch wrote:
> John Sauter via tz <tz at iana.org> wrote:
> > 
> > Based on the way the Earth has been rotating recently, the next
> > leap
> > second will be around the end of this decade, and it will be a
> > negative
> > leap second.
> 
> Yikes! I have re-calculated the "PREDICTIONS" formulae from the
> latest
> Bulletin A and I get the numbers below (which agree with your
> statement).
> 
> https://datacenter.iers.org/data/latestVersion/6_BULLETIN_A_V2013_016.txt
> 
> 2022-01-01 MJD 59580 UT1-UTC -0.077349 +/- 0.015906
> 2023-01-01 MJD 59945 UT1-UTC +0.017592 +/- 0.031025
> 2024-01-01 MJD 60310 UT1-UTC +0.112533 +/- 0.043922
> 2025-01-01 MJD 60676 UT1-UTC +0.207565 +/- 0.055679
> 2026-01-01 MJD 61041 UT1-UTC +0.302505 +/- 0.066625
> 2027-01-01 MJD 61406 UT1-UTC +0.397446 +/- 0.076999
> 2028-01-01 MJD 61771 UT1-UTC +0.492388 +/- 0.086926
> 2029-01-01 MJD 62137 UT1-UTC +0.587419 +/- 0.096513
> 2030-01-01 MJD 62502 UT1-UTC +0.682360 +/- 0.105767
> 
> Tony.

As a prelude to the negative leap second, I expect the IERS to issue a
Bulletin D around the beginning of July this year to increase DUT1 from
-0.2 to -0.1.  This will be the first increase in DUT1 not caused by a
leap second.
    John Sauter (John_Sauter at systemeyescomputerstore.com)
-- 
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John_Sauter at systemeyescomputerstore.com

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