All CGSIC,

No Leap Second

INTERNATIONAL EARTH ROTATION AND REFERENCE SYSTEMS SERVICE (IERS)

Paris, 09 January 2023

Bulletin C 65

To authorities responsible for the measurement and distribution of time:

INFORMATION ON UTC - TAI

NO leap second will be introduced at the end of June 2023.

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.

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Rick Hamilton
CGSIC Executive Secretariat
GPS Information Analysis Team Lead
U.S. Coast Guard Navigation Center
703-313-5930