Wednesday, July 8, 2015


                                             Paris, 7 July 2015

                                             Bulletin C 50
                                             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 2015.
 The difference between Coordinated Universal Time UTC and the 
 International Atomic Time TAI is :                
     from 2015 July 1, 0h UTC, until further notice : UTC-TAI = -36 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.

                                            Daniel GAMBIS
                                            Earth Orientation Center of IERS
                                            Observatoire de Paris, France

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