1# <pre>
2# @(#)leapseconds 8.13
3# This file is in the public domain, so clarified as of
4# 2009-05-17 by Arthur David Olson.
5
6# Allowance for leapseconds added to each timezone file.
7
8# The International Earth Rotation Service periodically uses leap seconds
9# to keep UTC to within 0.9 s of UT1
10# (which measures the true angular orientation of the earth in space); see
11# Terry J Quinn, The BIPM and the accurate measure of time,
12# Proc IEEE 79, 7 (July 1991), 894-905.
13# There were no leap seconds before 1972, because the official mechanism
14# accounting for the discrepancy between atomic time and the earth's rotation
15# did not exist until the early 1970s.
16
17# The correction (+ or -) is made at the given time, so lines
18# will typically look like:
19# Leap YEAR MON DAY 23:59:60 + R/S
20# or
21# Leap YEAR MON DAY 23:59:59 - R/S
22
23# If the leapsecond is Rolling (R) the given time is local time
24# If the leapsecond is Stationary (S) the given time is UTC
25
26# Leap YEAR MONTH DAY HH:MM:SS CORR R/S
27Leap 1972 Jun 30 23:59:60 + S
28Leap 1972 Dec 31 23:59:60 + S
29Leap 1973 Dec 31 23:59:60 + S
30Leap 1974 Dec 31 23:59:60 + S
31Leap 1975 Dec 31 23:59:60 + S
32Leap 1976 Dec 31 23:59:60 + S
33Leap 1977 Dec 31 23:59:60 + S
34Leap 1978 Dec 31 23:59:60 + S
35Leap 1979 Dec 31 23:59:60 + S
36Leap 1981 Jun 30 23:59:60 + S
37Leap 1982 Jun 30 23:59:60 + S
38Leap 1983 Jun 30 23:59:60 + S
39Leap 1985 Jun 30 23:59:60 + S
40Leap 1987 Dec 31 23:59:60 + S
41Leap 1989 Dec 31 23:59:60 + S
42Leap 1990 Dec 31 23:59:60 + S
43Leap 1992 Jun 30 23:59:60 + S
44Leap 1993 Jun 30 23:59:60 + S
45Leap 1994 Jun 30 23:59:60 + S
46Leap 1995 Dec 31 23:59:60 + S
47Leap 1997 Jun 30 23:59:60 + S
48Leap 1998 Dec 31 23:59:60 + S
49Leap 2005 Dec 31 23:59:60 + S
50Leap 2008 Dec 31 23:59:60 + S
51Leap 2012 Jun 30 23:59:60 + S
52
53# INTERNATIONAL EARTH ROTATION AND REFERENCE SYSTEMS SERVICE (IERS)
54#
55# SERVICE INTERNATIONAL DE LA ROTATION TERRESTRE ET DES SYSTEMES DE REFERENCE
56#
57#
58# SERVICE DE LA ROTATION TERRESTRE
59# OBSERVATOIRE DE PARIS
60# 61, Av. de l'Observatoire 75014 PARIS (France)
61# Tel. : 33 (0) 1 40 51 22 26
62# FAX : 33 (0) 1 40 51 22 91
63# e-mail : (E-Mail Removed)
64# http://hpiers.obspm.fr/eop-pc
65#
66# Paris, 5 January 2012
67#
68#
69# Bulletin C 43
70#
71# To authorities responsible
72# for the measurement and
73# distribution of time
74#
75#
76# UTC TIME STEP
77# on the 1st of July 2012
78#
79#
80# A positive leap second will be introduced at the end of June 2012.
81# The sequence of dates of the UTC second markers will be:
82#
83# 2012 June 30, 23h 59m 59s
84# 2012 June 30, 23h 59m 60s
85# 2012 July 1, 0h 0m 0s
86#
87# The difference between UTC and the International Atomic Time TAI is:
88#
89# from 2009 January 1, 0h UTC, to 2012 July 1 0h UTC : UTC-TAI = - 34s
90# from 2012 July 1, 0h UTC, until further notice : UTC-TAI = - 35s
91#
92# Leap seconds can be introduced in UTC at the end of the months of December
93# or June, depending on the evolution of UT1-TAI. Bulletin C is mailed every
94# six months, either to announce a time step in UTC or to confirm that there
95# will be no time step at the next possible date.
96#
97#
98# Daniel GAMBIS
99# Head
100# Earth Orientation Center of IERS
101# Observatoire de Paris, France
2# @(#)leapseconds 8.13
3# This file is in the public domain, so clarified as of
4# 2009-05-17 by Arthur David Olson.
5
6# Allowance for leapseconds added to each timezone file.
7
8# The International Earth Rotation Service periodically uses leap seconds
9# to keep UTC to within 0.9 s of UT1
10# (which measures the true angular orientation of the earth in space); see
11# Terry J Quinn, The BIPM and the accurate measure of time,
12# Proc IEEE 79, 7 (July 1991), 894-905.
13# There were no leap seconds before 1972, because the official mechanism
14# accounting for the discrepancy between atomic time and the earth's rotation
15# did not exist until the early 1970s.
16
17# The correction (+ or -) is made at the given time, so lines
18# will typically look like:
19# Leap YEAR MON DAY 23:59:60 + R/S
20# or
21# Leap YEAR MON DAY 23:59:59 - R/S
22
23# If the leapsecond is Rolling (R) the given time is local time
24# If the leapsecond is Stationary (S) the given time is UTC
25
26# Leap YEAR MONTH DAY HH:MM:SS CORR R/S
27Leap 1972 Jun 30 23:59:60 + S
28Leap 1972 Dec 31 23:59:60 + S
29Leap 1973 Dec 31 23:59:60 + S
30Leap 1974 Dec 31 23:59:60 + S
31Leap 1975 Dec 31 23:59:60 + S
32Leap 1976 Dec 31 23:59:60 + S
33Leap 1977 Dec 31 23:59:60 + S
34Leap 1978 Dec 31 23:59:60 + S
35Leap 1979 Dec 31 23:59:60 + S
36Leap 1981 Jun 30 23:59:60 + S
37Leap 1982 Jun 30 23:59:60 + S
38Leap 1983 Jun 30 23:59:60 + S
39Leap 1985 Jun 30 23:59:60 + S
40Leap 1987 Dec 31 23:59:60 + S
41Leap 1989 Dec 31 23:59:60 + S
42Leap 1990 Dec 31 23:59:60 + S
43Leap 1992 Jun 30 23:59:60 + S
44Leap 1993 Jun 30 23:59:60 + S
45Leap 1994 Jun 30 23:59:60 + S
46Leap 1995 Dec 31 23:59:60 + S
47Leap 1997 Jun 30 23:59:60 + S
48Leap 1998 Dec 31 23:59:60 + S
49Leap 2005 Dec 31 23:59:60 + S
50Leap 2008 Dec 31 23:59:60 + S
51Leap 2012 Jun 30 23:59:60 + S
52
53# INTERNATIONAL EARTH ROTATION AND REFERENCE SYSTEMS SERVICE (IERS)
54#
55# SERVICE INTERNATIONAL DE LA ROTATION TERRESTRE ET DES SYSTEMES DE REFERENCE
56#
57#
58# SERVICE DE LA ROTATION TERRESTRE
59# OBSERVATOIRE DE PARIS
60# 61, Av. de l'Observatoire 75014 PARIS (France)
61# Tel. : 33 (0) 1 40 51 22 26
62# FAX : 33 (0) 1 40 51 22 91
63# e-mail : (E-Mail Removed)
64# http://hpiers.obspm.fr/eop-pc
65#
66# Paris, 5 January 2012
67#
68#
69# Bulletin C 43
70#
71# To authorities responsible
72# for the measurement and
73# distribution of time
74#
75#
76# UTC TIME STEP
77# on the 1st of July 2012
78#
79#
80# A positive leap second will be introduced at the end of June 2012.
81# The sequence of dates of the UTC second markers will be:
82#
83# 2012 June 30, 23h 59m 59s
84# 2012 June 30, 23h 59m 60s
85# 2012 July 1, 0h 0m 0s
86#
87# The difference between UTC and the International Atomic Time TAI is:
88#
89# from 2009 January 1, 0h UTC, to 2012 July 1 0h UTC : UTC-TAI = - 34s
90# from 2012 July 1, 0h UTC, until further notice : UTC-TAI = - 35s
91#
92# Leap seconds can be introduced in UTC at the end of the months of December
93# or June, depending on the evolution of UT1-TAI. Bulletin C is mailed every
94# six months, either to announce a time step in UTC or to confirm that there
95# will be no time step at the next possible date.
96#
97#
98# Daniel GAMBIS
99# Head
100# Earth Orientation Center of IERS
101# Observatoire de Paris, France