1 # <pre> 2 # @(#)leapseconds 8.10 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 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 52 # INTERNATIONAL EARTH ROTATION AND REFERENCE SYSTEMS SERVICE (IERS) 53 # 54 # SERVICE INTERNATIONAL DE LA ROTATION TERRESTRE ET DES SYSTEMES DE REFERENCE 55 # 56 # SERVICE DE LA ROTATION TERRESTRE 57 # OBSERVATOIRE DE PARIS 58 # 61, Av. de l'Observatoire 75014 PARIS (France) 59 # Tel. : 33 (0) 1 40 51 22 26 60 # FAX : 33 (0) 1 40 51 22 91 61 # Internet : services.iers (a] obspm.fr 62 # 63 # Paris, 14 July 2010 64 # 65 # Bulletin C 40 66 # 67 # To authorities responsible 68 # for the measurement and 69 # distribution of time 70 # 71 # INFORMATION ON UTC - TAI 72 # 73 # NO positive leap second will be introduced at the end of December 2010. 74 # The difference between Coordinated Universal Time UTC and the 75 # International Atomic Time TAI is : 76 # 77 # from 2009 January 1, 0h UTC, until further notice : UTC-TAI = -34 s 78 # 79 # Leap seconds can be introduced in UTC at the end of the months of December 80 # or June, depending on the evolution of UT1-TAI. Bulletin C is mailed every 81 # six months, either to announce a time step in UTC, or to confirm that there 82 # will be no time step at the next possible date. 83 # 84 # Daniel GAMBIS 85 # Director 86 # Earth Orientation Center of IERS 87 # Observatoire de Paris, France 88
