# <pre>


# This file is in the public domain, so clarified as of


# 2009-05-17 by Arthur David Olson.





# Allowance for leapseconds added to each timezone file.





# The International Earth Rotation Service periodically uses leap seconds


# to keep UTC to within 0.9 s of UT1


# (which measures the true angular orientation of the earth in space); see


# Terry J Quinn, The BIPM and the accurate measure of time,


# Proc IEEE 79, 7 (July 1991), 894-905.


# There were no leap seconds before 1972, because the official mechanism


# accounting for the discrepancy between atomic time and the earth's rotation


# did not exist until the early 1970s.





# The correction (+ or -) is made at the given time, so lines


# will typically look like:


#	Leap	YEAR	MON	DAY	23:59:60	+	R/S


# or


#	Leap	YEAR	MON	DAY	23:59:59	-	R/S





# If the leapsecond is Rolling (R) the given time is local time


# If the leapsecond is Stationary (S) the given time is UTC





# Leap	YEAR	MONTH	DAY	HH:MM:SS	CORR	R/S


Leap	1972	Jun	30	23:59:60	+	S


Leap	1972	Dec	31	23:59:60	+	S


Leap	1973	Dec	31	23:59:60	+	S


Leap	1974	Dec	31	23:59:60	+	S


Leap	1975	Dec	31	23:59:60	+	S


Leap	1976	Dec	31	23:59:60	+	S


Leap	1977	Dec	31	23:59:60	+	S


Leap	1978	Dec	31	23:59:60	+	S


Leap	1979	Dec	31	23:59:60	+	S


Leap	1981	Jun	30	23:59:60	+	S


Leap	1982	Jun	30	23:59:60	+	S


Leap	1983	Jun	30	23:59:60	+	S


Leap	1985	Jun	30	23:59:60	+	S


Leap	1987	Dec	31	23:59:60	+	S


Leap	1989	Dec	31	23:59:60	+	S


Leap	1990	Dec	31	23:59:60	+	S


Leap	1992	Jun	30	23:59:60	+	S


Leap	1993	Jun	30	23:59:60	+	S


Leap	1994	Jun	30	23:59:60	+	S


Leap	1995	Dec	31	23:59:60	+	S


Leap	1997	Jun	30	23:59:60	+	S


Leap	1998	Dec	31	23:59:60	+	S


Leap	2005	Dec	31	23:59:60	+	S


Leap	2008	Dec	31	23:59:60	+	S


Leap	2012	Jun	30	23:59:60	+	S





# INTERNATIONAL EARTH ROTATION AND REFERENCE SYSTEMS SERVICE (IERS)


#


# SERVICE INTERNATIONAL DE LA ROTATION TERRESTRE ET DES SYSTEMES DE REFERENCE


#


#


# SERVICE DE LA ROTATION TERRESTRE


# 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


# e-mail    : (E-Mail Removed)


# http://hpiers.obspm.fr/eop-pc


#


# 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


