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 (0) 1 40 51 22 26
FAX       : 33 (0) 1 40 51 22 91
e-mail    : services.iers@obspm.fr
http://hpiers.obspm.fr/eop-pc


Paris, 5 January 2015


Bulletin C 49


To authorities responsible for the measurement and distribution of time




UTC TIME STEP
on the 1st of July 2015




A positive leap second will be introduced at the end of June 2015.
The sequence of dates of the UTC second markers will be:


2015 June 30,     23h 59m 59s
2015 June 30,     23h 59m 60s
2015 July  1,      0h  0m  0s


The difference between UTC and the International Atomic Time TAI is:


from 2012 July 1,    0h UTC, to 2015 July 1  0h UTC  : UTC-TAI = - 35s
from 2015 July 1,    0h UTC, until further notice    : UTC-TAI = - 36s






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.




Daniel Gambis
Head
Earth Orientation Center of IERS
Observatoire de Paris, France