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Paris, 5 January 2012

Bulletin C 43

To authorities responsible for the measurement and distribution of time

 

UTC TIME STEP on the 1st of July 2012

 

A positive leap second will be introduced at the end of June 2012.

The sequence of dates of the UTC second markers will be:

 

2012 June 30, 23h 59m 59s

2012 June 30, 23h 59m 60s

2012 July 1, 0h 0m 0s

 

The difference between UTC and the International Atomic Time TAI is:

 

from 2009 January 1, 0h UTC, to 2012 July 1 0h UTC : UTC-TAI = - 34s

from 2012 July 1, 0h UTC, until further notice : UTC-TAI = - 35s

 

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

Head

Earth Orientation Center of IERS

Observatoire de Paris, France