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No leap second will be introduced
at the end of December 2021.
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 = -37s
Leap seconds can be introduced in UTC at the end of the months
of December or June, depending on the evolution of UT1-TAI.
Information provided by:
Earth Orientation Center of IERS
Observatoire de Paris, France