Updates to historic rules only for: part of Alaska, Algeria, Bulgaria,
Colombia, Easter Island, Italy, Malta, Mexico, Mongolia, Montserrat,
Puerto Rico, Poland, Russia, South Korea, Spain, part of North Dakota,
United Kingdom, Uruguay, Uzbekistan
Updates to current and future rules for: Guatemala, Haiti, Honduras,
part of Indiana, Iran, Nicaragua, Palestinian Territories, Sri Lanka,
Tunisia,
Updates to future rules only for: Canada, Thule AFB in Greenland
of important changes to European and South and Central American countries
which should be back-ported to 3.x.
Obtained from: ftp://elsie.nci.nih.gov/pub/tzdata1999a.tar.gz
SERVICE INTERNATIONAL DE LA ROTATION TERRESTRE
BUREAU CENTRAL DE L'IERS
OBSERVATOIRE DE PARIS
61, Av. de l'Observatoire 75014 PARIS (France)
Tel. : 33 (0) 1 40 51 22 26
FAX : 33 (0) 1 40 51 22 91
Internet : iers@obspm.fr
Paris, 17 July 1998
Bulletin C 16
To authorities responsible for
the measurement and distribution
of time
UTC TIME STEP
on the 1st of January 1999
A positive leap second will be introduced at the end of December 1998.
The sequence of dates of the UTC second markers will be:
1998 December 31, 23h 59m 59s
1998 December 31, 23h 59m 60s
1999 January 1, 0h 0m 0s
The difference between UTC and the International Atomic Time TAI is:
from 1997 July 1, 0h UTC, to 1999 January 1, 0h UTC : UTC-TAI = - 31s
from 1999 January 1, 0h UTC, until further notice : UTC-TAI = - 32s
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 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
Central Bureau of IERS
