3
# Allowance for leapseconds added to each timezone file.
5
# The International Earth Rotation Service periodically uses leap seconds
6
# to keep UTC to within 0.9 s of UT1
7
# (which measures the true angular orientation of the earth in space); see
8
# Terry J Quinn, The BIPM and the accurate measure of time,
9
# Proc IEEE 79, 7 (July 1991), 894-905.
10
# There were no leap seconds before 1972, because the official mechanism
11
# accounting for the discrepancy between atomic time and the earth's rotation
12
# did not exist until the early 1970s.
14
# The correction (+ or -) is made at the given time, so lines
15
# will typically look like:
16
# Leap YEAR MON DAY 23:59:60 + R/S
18
# Leap YEAR MON DAY 23:59:59 - R/S
20
# If the leapsecond is Rolling (R) the given time is local time
21
# If the leapsecond is Stationary (S) the given time is UTC
23
# Leap YEAR MONTH DAY HH:MM:SS CORR R/S
24
Leap 1972 Jun 30 23:59:60 + S
25
Leap 1972 Dec 31 23:59:60 + S
26
Leap 1973 Dec 31 23:59:60 + S
27
Leap 1974 Dec 31 23:59:60 + S
28
Leap 1975 Dec 31 23:59:60 + S
29
Leap 1976 Dec 31 23:59:60 + S
30
Leap 1977 Dec 31 23:59:60 + S
31
Leap 1978 Dec 31 23:59:60 + S
32
Leap 1979 Dec 31 23:59:60 + S
33
Leap 1981 Jun 30 23:59:60 + S
34
Leap 1982 Jun 30 23:59:60 + S
35
Leap 1983 Jun 30 23:59:60 + S
36
Leap 1985 Jun 30 23:59:60 + S
37
Leap 1987 Dec 31 23:59:60 + S
38
Leap 1989 Dec 31 23:59:60 + S
39
Leap 1990 Dec 31 23:59:60 + S
40
Leap 1992 Jun 30 23:59:60 + S
41
Leap 1993 Jun 30 23:59:60 + S
42
Leap 1994 Jun 30 23:59:60 + S
43
Leap 1995 Dec 31 23:59:60 + S
44
Leap 1997 Jun 30 23:59:60 + S
45
Leap 1998 Dec 31 23:59:60 + S
46
Leap 2005 Dec 31 23:59:60 + S
47
Leap 2008 Dec 31 23:59:60 + S
49
# INTERNATIONAL EARTH ROTATION AND REFERENCE SYSTEMS SERVICE (IERS)
51
# SERVICE INTERNATIONAL DE LA ROTATION TERRESTRE ET DES SYSTEMES DE REFERENCE
53
# SERVICE DE LA ROTATION TERRESTRE
54
# OBSERVATOIRE DE PARIS
55
# 61, Av. de l'Observatoire 75014 PARIS (France)
56
# Tel. : 33 (0) 1 40 51 22 26
57
# FAX : 33 (0) 1 40 51 22 91
58
# e-mail : services.iers@obspm.fr
59
# http://hpiers.obspm.fr/eop-pc
65
# To authorities responsible
66
# for the measurement and
67
# distribution of time
70
# on the 1st of January 2009
72
# A positive leap second will be introduced at the end of December 2008.
73
# The sequence of dates of the UTC second markers will be:
75
# 2008 December 31, 23h 59m 59s
76
# 2008 December 31, 23h 59m 60s
77
# 2009 January 1, 0h 0m 0s
79
# The difference between UTC and the International Atomic Time TAI is:
81
# from 2006 January 1, 0h UTC, to 2009 January 1 0h UTC : UTC-TAI = - 33s
82
# from 2009 January 1, 0h UTC, until further notice : UTC-TAI = - 34s
84
# Leap seconds can be introduced in UTC at the end of the months of December
85
# or June, depending on the evolution of UT1-TAI. Bulletin C is mailed every
86
# six months, either to announce a time step in UTC or to confirm that there
87
# will be no time step at the next possible date.
91
# Earth Orientation Center of IERS
92
# Observatoire de Paris, France