3 # Allowance for leapseconds added to each timezone file.
5 # $PostgreSQL: pgsql/src/timezone/data/leapseconds,v 1.4 2006/03/11 04:38:41 momjian Exp $
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.
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
20 # Leap YEAR MON DAY 23:59:59 - R/S
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
25 # Leap YEAR MONTH DAY HH:MM:SS CORR R/S
26 Leap 1972 Jun 30 23:59:60 + S
27 Leap 1972 Dec 31 23:59:60 + S
28 Leap 1973 Dec 31 23:59:60 + S
29 Leap 1974 Dec 31 23:59:60 + S
30 Leap 1975 Dec 31 23:59:60 + S
31 Leap 1976 Dec 31 23:59:60 + S
32 Leap 1977 Dec 31 23:59:60 + S
33 Leap 1978 Dec 31 23:59:60 + S
34 Leap 1979 Dec 31 23:59:60 + S
35 Leap 1981 Jun 30 23:59:60 + S
36 Leap 1982 Jun 30 23:59:60 + S
37 Leap 1983 Jun 30 23:59:60 + S
38 Leap 1985 Jun 30 23:59:60 + S
39 Leap 1987 Dec 31 23:59:60 + S
40 Leap 1989 Dec 31 23:59:60 + S
41 Leap 1990 Dec 31 23:59:60 + S
42 Leap 1992 Jun 30 23:59:60 + S
43 Leap 1993 Jun 30 23:59:60 + S
44 Leap 1994 Jun 30 23:59:60 + S
45 Leap 1995 Dec 31 23:59:60 + S
46 Leap 1997 Jun 30 23:59:60 + S
47 Leap 1998 Dec 31 23:59:60 + S
48 Leap 2005 Dec 31 23:59:60 + S
50 # INTERNATIONAL EARTH ROTATION AND REFERENCE SYSTEMS SERVICE (IERS)
52 # SERVICE INTERNATIONAL DE LA ROTATION TERRESTRE ET DES SYSTEMES DE REFERENCE
54 # SERVICE DE LA ROTATION TERRESTRE
55 # OBSERVATOIRE DE PARIS
56 # 61, Av. de l'Observatoire 75014 PARIS (France)
57 # Tel. : 33 (0) 1 40 51 22 26
58 # FAX : 33 (0) 1 40 51 22 91
60 # http://hpiers.obspm.fr/eop-pc
66 # To authorities responsible
67 # for the measurement and
68 # distribution of time
72 # on the 1st of January 2006
74 # A positive leap second will be introduced at the end of December 2005.
75 # The sequence of dates of the UTC second markers will be:
77 # 2005 December 31, 23h 59m 59s
78 # 2005 December 31, 23h 59m 60s
79 # 2006 January 1, 0h 0m 0s
81 # The difference between UTC and the International Atomic Time TAI is:
83 # from 1999 January 1, 0h UTC, to 2006 January 1 0h UTC : UTC-TAI = - 32s
84 # from 2006 January 1, 0h UTC, until further notice : UTC-TAI = - 33s
86 # Leap seconds can be introduced in UtC at the end of the months of December
87 # or June, depending on the evolution of UT1-TAI. Bulletin C is mailed every
88 # six months, either to announce a time step in UTC or to confirm that there
89 # will be no time step at the next possible date.
93 # Earth Orientation Center of IERS
94 # Observatoire de Paris, France