# <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 |