3 # This file is in the public domain, so clarified as of
4 # 2009-05-17 by Arthur David Olson.
6 # Allowance for leapseconds added to each timezone file.
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.
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
21 # Leap YEAR MON DAY 23:59:59 - R/S
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
26 # Leap YEAR MONTH DAY HH:MM:SS CORR R/S
27 Leap 1972 Jun 30 23:59:60 + S
28 Leap 1972 Dec 31 23:59:60 + S
29 Leap 1973 Dec 31 23:59:60 + S
30 Leap 1974 Dec 31 23:59:60 + S
31 Leap 1975 Dec 31 23:59:60 + S
32 Leap 1976 Dec 31 23:59:60 + S
33 Leap 1977 Dec 31 23:59:60 + S
34 Leap 1978 Dec 31 23:59:60 + S
35 Leap 1979 Dec 31 23:59:60 + S
36 Leap 1981 Jun 30 23:59:60 + S
37 Leap 1982 Jun 30 23:59:60 + S
38 Leap 1983 Jun 30 23:59:60 + S
39 Leap 1985 Jun 30 23:59:60 + S
40 Leap 1987 Dec 31 23:59:60 + S
41 Leap 1989 Dec 31 23:59:60 + S
42 Leap 1990 Dec 31 23:59:60 + S
43 Leap 1992 Jun 30 23:59:60 + S
44 Leap 1993 Jun 30 23:59:60 + S
45 Leap 1994 Jun 30 23:59:60 + S
46 Leap 1995 Dec 31 23:59:60 + S
47 Leap 1997 Jun 30 23:59:60 + S
48 Leap 1998 Dec 31 23:59:60 + S
49 Leap 2005 Dec 31 23:59:60 + S
50 Leap 2008 Dec 31 23:59:60 + S
51 Leap 2012 Jun 30 23:59:60 + S
53 # INTERNATIONAL EARTH ROTATION AND REFERENCE SYSTEMS SERVICE (IERS)
55 # SERVICE INTERNATIONAL DE LA ROTATION TERRESTRE ET DES SYSTEMES DE REFERENCE
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
66 # Paris, 5 January 2012
71 # To authorities responsible
72 # for the measurement and
73 # distribution of time
77 # on the 1st of July 2012
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:
83 # 2012 June 30, 23h 59m 59s
84 # 2012 June 30, 23h 59m 60s
85 # 2012 July 1, 0h 0m 0s
87 # The difference between UTC and the International Atomic Time TAI is:
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
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.
100 # Earth Orientation Center of IERS
101 # Observatoire de Paris, France