1# @(#)leapseconds 7.13
2
3# $FreeBSD: head/share/zoneinfo/leapseconds 75267 2001-04-06 16:46:52Z wollman $
4
5# Allowance for leapseconds added to each timezone file.
6
7# The International Earth Rotation Service periodically uses leap seconds
8# to keep UTC to within 0.9 s of UT1
9# (which measures the true angular orientation of the earth in space); see
10# Terry J Quinn, The BIPM and the accurate measure of time,
11# Proc IEEE 79, 7 (July 1991), 894-905.
12# There were no leap seconds before 1972, because the official mechanism
13# accounting for the discrepancy between atomic time and the earth's rotation
14# did not exist until the early 1970s.
15
16# The correction (+ or -) is made at the given time, so lines
17# will typically look like:
18# Leap YEAR MON DAY 23:59:60 + R/S
19# or
20# Leap YEAR MON DAY 23:59:59 - R/S
21
22# If the leapsecond is Rolling (R) the given time is local time
23# If the leapsecond is Stationary (S) the given time is UTC
24
25# Leap YEAR MONTH DAY HH:MM:SS CORR R/S
26Leap 1972 Jun 30 23:59:60 + S
27Leap 1972 Dec 31 23:59:60 + S
28Leap 1973 Dec 31 23:59:60 + S
29Leap 1974 Dec 31 23:59:60 + S
30Leap 1975 Dec 31 23:59:60 + S
31Leap 1976 Dec 31 23:59:60 + S
32Leap 1977 Dec 31 23:59:60 + S
33Leap 1978 Dec 31 23:59:60 + S
34Leap 1979 Dec 31 23:59:60 + S
35Leap 1981 Jun 30 23:59:60 + S
36Leap 1982 Jun 30 23:59:60 + S
37Leap 1983 Jun 30 23:59:60 + S
38Leap 1985 Jun 30 23:59:60 + S
39Leap 1987 Dec 31 23:59:60 + S
40Leap 1989 Dec 31 23:59:60 + S
41Leap 1990 Dec 31 23:59:60 + S
42Leap 1992 Jun 30 23:59:60 + S
43Leap 1993 Jun 30 23:59:60 + S
44Leap 1994 Jun 30 23:59:60 + S
45Leap 1995 Dec 31 23:59:60 + S
46Leap 1997 Jun 30 23:59:60 + S
47Leap 1998 Dec 31 23:59:60 + S
48# INTERNATIONAL EARTH ROTATION SERVICE (IERS)
49# SERVICE INTERNATIONAL DE LA ROTATION TERRESTRE
50#
51# SERVICE DE LA ROTATION TERRESTRE
52# OBSERVATOIRE DE PARIS
53# 61, Av. de l'Observatoire 75014 PARIS (France)
54# Tel. : 33 (0) 1 40 51 22 26
55# FAX : 33 (0) 1 40 51 22 91
56# Internet : iers@obspm.fr
57#
58# Paris, 11 January 2001
59#
60# Bulletin C 21
61#
62# To authorities responsible for the measurement and distribution of time
63#
64# INFORMATION ON UTC - TAI
65#
66# NO positive leap second will be introduced at the end of June 2001.
2
3# $FreeBSD: head/share/zoneinfo/leapseconds 75267 2001-04-06 16:46:52Z wollman $
4
5# Allowance for leapseconds added to each timezone file.
6
7# The International Earth Rotation Service periodically uses leap seconds
8# to keep UTC to within 0.9 s of UT1
9# (which measures the true angular orientation of the earth in space); see
10# Terry J Quinn, The BIPM and the accurate measure of time,
11# Proc IEEE 79, 7 (July 1991), 894-905.
12# There were no leap seconds before 1972, because the official mechanism
13# accounting for the discrepancy between atomic time and the earth's rotation
14# did not exist until the early 1970s.
15
16# The correction (+ or -) is made at the given time, so lines
17# will typically look like:
18# Leap YEAR MON DAY 23:59:60 + R/S
19# or
20# Leap YEAR MON DAY 23:59:59 - R/S
21
22# If the leapsecond is Rolling (R) the given time is local time
23# If the leapsecond is Stationary (S) the given time is UTC
24
25# Leap YEAR MONTH DAY HH:MM:SS CORR R/S
26Leap 1972 Jun 30 23:59:60 + S
27Leap 1972 Dec 31 23:59:60 + S
28Leap 1973 Dec 31 23:59:60 + S
29Leap 1974 Dec 31 23:59:60 + S
30Leap 1975 Dec 31 23:59:60 + S
31Leap 1976 Dec 31 23:59:60 + S
32Leap 1977 Dec 31 23:59:60 + S
33Leap 1978 Dec 31 23:59:60 + S
34Leap 1979 Dec 31 23:59:60 + S
35Leap 1981 Jun 30 23:59:60 + S
36Leap 1982 Jun 30 23:59:60 + S
37Leap 1983 Jun 30 23:59:60 + S
38Leap 1985 Jun 30 23:59:60 + S
39Leap 1987 Dec 31 23:59:60 + S
40Leap 1989 Dec 31 23:59:60 + S
41Leap 1990 Dec 31 23:59:60 + S
42Leap 1992 Jun 30 23:59:60 + S
43Leap 1993 Jun 30 23:59:60 + S
44Leap 1994 Jun 30 23:59:60 + S
45Leap 1995 Dec 31 23:59:60 + S
46Leap 1997 Jun 30 23:59:60 + S
47Leap 1998 Dec 31 23:59:60 + S
48# INTERNATIONAL EARTH ROTATION SERVICE (IERS)
49# SERVICE INTERNATIONAL DE LA ROTATION TERRESTRE
50#
51# SERVICE DE LA ROTATION TERRESTRE
52# OBSERVATOIRE DE PARIS
53# 61, Av. de l'Observatoire 75014 PARIS (France)
54# Tel. : 33 (0) 1 40 51 22 26
55# FAX : 33 (0) 1 40 51 22 91
56# Internet : iers@obspm.fr
57#
58# Paris, 11 January 2001
59#
60# Bulletin C 21
61#
62# To authorities responsible for the measurement and distribution of time
63#
64# INFORMATION ON UTC - TAI
65#
66# NO positive leap second will be introduced at the end of June 2001.