> /!\ No leap second will be introduced at the end of December 2026 /!\

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@obspm.fr
http://hpiers.obspm.fr/eop-pc


                                              Paris, 06 July 2026


                                              Bulletin C 72

                                              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 2026.
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

https://datacenter.iers.org/data/latest … letinC.txt