[tz] Fwd: Bulletin C number 57

[Tim Parenti]

FYI, per IERS Bulletin C57, there will be no leap second on 2019-06-30.

Unfortunately, NIST is affected by the partial shutdown of the US government
<https://www.commerce.gov/news/blog/2018/12/shutdown-due-lapse-congressional-appropriations>
which
has been ongoing since 2018-12-22 00:00 -05, so most of their website is
unavailable, meaning it will likely be some time before they publish an
updated leap-seconds.list.  But since the current NIST file doesn't expire
until 2019-06-28, we've got some time before we have to deal with that.

Last we had left the problem of being able to take the equivalent file
directly from the IERS at
https://hpiers.obspm.fr/iers/bul/bulc/ntp/leap-seconds.list, some lines had
been added to https://hpiers.obspm.fr/iers/bul/bulc/README on 2017-04-11,
but the exact text did not make any assertions about surrounding files, and
we would prefer the notice be added to leap-seconds.list itself.  (There
are a few other typos therein which I spotted as well.)

See:
https://mm.icann.org/pipermail/tz/2017-April/024990.html
https://mm.icann.org/pipermail/tz/2017-April/024988.html

In light of the current US/NIST situation, it would be helpful to
re-energize these efforts.  Happy to help Christian and others come up with
something workable.

--
Tim Parenti


---------- Forwarded message ---------
From: IERS EOP Product Center <iers.eoppc at obspm.fr>
Date: Mon, 7 Jan 2019 at 10:56
Subject: Bulletin C number 57
To: <bulc.iers at obspm.fr>





     INTERNATIONAL EARTH ROTATION AND REFERENCE SYSTEMS SERVICE (IERS)

SERVICE INTERNATIONAL DE LA ROTATION TERRESTRE ET DES SYSTEMES DE REFERENCE


SERVICE DE LA ROTATION TERRESTRE DE L'IERS
OBSERVATOIRE DE PARIS
61, Av. de l'Observatoire 75014 PARIS (France)
Tel.      : +33 1 40 51 23 35
e-mail    : services.iers at obspm.fr
http://hpiers.obspm.fr/eop-pc


                                              Paris, 07 January 2019


                                              Bulletin C 57

                                              To authorities responsible
                                              for the measurement and
                                              distribution of time



                          INFORMATION ON UTC - TAI


 NO leap second will be introduced at the end of June 2019.
 The difference between Coordinated Universal Time UTC and the
 International Atomic Time TAI is :

     from 2017 January 1, 0h UTC, until further notice : UTC-TAI = -37 s

 Leap seconds can be introduced in UTC at the end of the months of December
 or June,  depending on the evolution of UT1-TAI. Bulletin C is mailed every
 six months, either to announce a time step in UTC, or to confirm that there
 will be no time step at the next possible date.


                                            Christian BIZOUARD
                                            Director
                                            Earth Orientation Center of IERS
                                            Observatoire de Paris, France
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