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
Director
Earth Orientation Center of IERS
Observatoire de Paris, France
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