| 123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101 | # <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/SLeap	1972	Jun	30	23:59:60	+	SLeap	1972	Dec	31	23:59:60	+	SLeap	1973	Dec	31	23:59:60	+	SLeap	1974	Dec	31	23:59:60	+	SLeap	1975	Dec	31	23:59:60	+	SLeap	1976	Dec	31	23:59:60	+	SLeap	1977	Dec	31	23:59:60	+	SLeap	1978	Dec	31	23:59:60	+	SLeap	1979	Dec	31	23:59:60	+	SLeap	1981	Jun	30	23:59:60	+	SLeap	1982	Jun	30	23:59:60	+	SLeap	1983	Jun	30	23:59:60	+	SLeap	1985	Jun	30	23:59:60	+	SLeap	1987	Dec	31	23:59:60	+	SLeap	1989	Dec	31	23:59:60	+	SLeap	1990	Dec	31	23:59:60	+	SLeap	1992	Jun	30	23:59:60	+	SLeap	1993	Jun	30	23:59:60	+	SLeap	1994	Jun	30	23:59:60	+	SLeap	1995	Dec	31	23:59:60	+	SLeap	1997	Jun	30	23:59:60	+	SLeap	1998	Dec	31	23:59:60	+	SLeap	2005	Dec	31	23:59:60	+	SLeap	2008	Dec	31	23:59:60	+	SLeap	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
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