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J. Duke319a3b92007-12-01 00:00:00 +00001#
2# DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
3#
4# This code is free software; you can redistribute it and/or modify it
5# under the terms of the GNU General Public License version 2 only, as
6# published by the Free Software Foundation. Sun designates this
7# particular file as subject to the "Classpath" exception as provided
8# by Sun in the LICENSE file that accompanied this code.
9#
10# This code is distributed in the hope that it will be useful, but WITHOUT
11# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12# FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13# version 2 for more details (a copy is included in the LICENSE file that
14# accompanied this code).
15#
16# You should have received a copy of the GNU General Public License version
17# 2 along with this work; if not, write to the Free Software Foundation,
18# Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19#
20# Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
21# CA 95054 USA or visit www.sun.com if you need additional information or
22# have any questions.
23#
24
25# Allowance for leapseconds added to each timezone file.
26
27# The International Earth Rotation Service periodically uses leap seconds
28# to keep UTC to within 0.9 s of UT1
29# (which measures the true angular orientation of the earth in space); see
30# Terry J Quinn, The BIPM and the accurate measure of time,
31# Proc IEEE 79, 7 (July 1991), 894-905.
32# There were no leap seconds before 1972, because the official mechanism
33# accounting for the discrepancy between atomic time and the earth's rotation
34# did not exist until the early 1970s.
35
36# The correction (+ or -) is made at the given time, so lines
37# will typically look like:
38# Leap YEAR MON DAY 23:59:60 + R/S
39# or
40# Leap YEAR MON DAY 23:59:59 - R/S
41
42# If the leapsecond is Rolling (R) the given time is local time
43# If the leapsecond is Stationary (S) the given time is UTC
44
45# Leap YEAR MONTH DAY HH:MM:SS CORR R/S
46Leap 1972 Jun 30 23:59:60 + S
47Leap 1972 Dec 31 23:59:60 + S
48Leap 1973 Dec 31 23:59:60 + S
49Leap 1974 Dec 31 23:59:60 + S
50Leap 1975 Dec 31 23:59:60 + S
51Leap 1976 Dec 31 23:59:60 + S
52Leap 1977 Dec 31 23:59:60 + S
53Leap 1978 Dec 31 23:59:60 + S
54Leap 1979 Dec 31 23:59:60 + S
55Leap 1981 Jun 30 23:59:60 + S
56Leap 1982 Jun 30 23:59:60 + S
57Leap 1983 Jun 30 23:59:60 + S
58Leap 1985 Jun 30 23:59:60 + S
59Leap 1987 Dec 31 23:59:60 + S
60Leap 1989 Dec 31 23:59:60 + S
61Leap 1990 Dec 31 23:59:60 + S
62Leap 1992 Jun 30 23:59:60 + S
63Leap 1993 Jun 30 23:59:60 + S
64Leap 1994 Jun 30 23:59:60 + S
65Leap 1995 Dec 31 23:59:60 + S
66Leap 1997 Jun 30 23:59:60 + S
67Leap 1998 Dec 31 23:59:60 + S
68Leap 2005 Dec 31 23:59:60 + S
69
70# INTERNATIONAL EARTH ROTATION AND REFERENCE SYSTEMS SERVICE (IERS)
71# SERVICE INTERNATIONAL DE LA ROTATION TERRESTRE ET DES SYSTEMES DE REFERENCE
72#
73# SERVICE DE LA ROTATION TERRESTRE
74# OBSERVATOIRE DE PARIS
75# 61, Av. de l'Observatoire 75014 PARIS (France)
76# Tel. : 33 (0) 1 40 51 22 26
77# FAX : 33 (0) 1 40 51 22 91
78# Internet : services.iers@obspm.fr
79#
80# Paris, 28 June 2007
81#
82# Bulletin C 34
83#
84# To authorities responsible
85# for the measurement and
86# distribution of time
87#
88# INFORMATION ON UTC - TAI
89#
90# NO positive leap second will be introduced at the end of December 2007.
91# The difference between Coordinated Universal Time UTC and the
92# International Atomic Time TAI is :
93#
94# from 2006 January 1, 0h UTC, until further notice : UTC-TAI = -33 s
95#
96# Leap seconds can be introduced in UTC at the end of the months of December
97# or June, depending on the evolution of UT1-TAI. Bulletin C is mailed every
98# six months, either to announce a time step in UTC, or to confirm that there
99# will be no time step at the next possible date.
100#
101# Daniel GAMBIS
102# Director
103# Earth Orientation Center of IERS
104# Observatoire de Paris, France