[LEAPSECS] Bulletin C #54 2017-07-06

[Zefram]

>     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, 06 July 2017
> 
> 
>                                              Bulletin C 54
> 
>                                              To authorities responsible
>                                              for the measurement and
>                                              distribution of time
> 
> 
> 
>                          INFORMATION ON UTC - TAI
> 
> 
> NO leap second will be introduced at the end of December 2017.
> 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

An inevitable decision: current Bulletin A has UT1-UTC crossing zero
(so, more solidly, UT1-TAI crossing an integer) on 2018-04-30, so does
not permit DTAI to have any other value for the first half of 2018.

-zefram