be82612009-07-23Henrik Grubbström (Grubba) # <pre>
abd0a42009-11-15Henrik Grubbström (Grubba) # @(#)leapseconds 8.9
be82612009-07-23Henrik Grubbström (Grubba) # This file is in the public domain, so clarified as of # 2009-05-17 by Arthur David Olson.
c0dbee2000-08-01Mirar (Pontus Hagland)  # Allowance for leapseconds added to each timezone file. # The International Earth Rotation Service periodically uses leap seconds # to keep UTC to within 0.9 s of UT1 # (which measures the true angular orientation of the earth in space); see # Terry J Quinn, The BIPM and the accurate measure of time, # Proc IEEE 79, 7 (July 1991), 894-905. # There were no leap seconds before 1972, because the official mechanism # accounting for the discrepancy between atomic time and the earth's rotation # did not exist until the early 1970s. # The correction (+ or -) is made at the given time, so lines # will typically look like: # Leap YEAR MON DAY 23:59:60 + R/S # or # Leap YEAR MON DAY 23:59:59 - R/S # If the leapsecond is Rolling (R) the given time is local time # If the leapsecond is Stationary (S) the given time is UTC # Leap YEAR MONTH DAY HH:MM:SS CORR R/S Leap 1972 Jun 30 23:59:60 + S Leap 1972 Dec 31 23:59:60 + S Leap 1973 Dec 31 23:59:60 + S Leap 1974 Dec 31 23:59:60 + S Leap 1975 Dec 31 23:59:60 + S Leap 1976 Dec 31 23:59:60 + S Leap 1977 Dec 31 23:59:60 + S Leap 1978 Dec 31 23:59:60 + S Leap 1979 Dec 31 23:59:60 + S Leap 1981 Jun 30 23:59:60 + S Leap 1982 Jun 30 23:59:60 + S Leap 1983 Jun 30 23:59:60 + S Leap 1985 Jun 30 23:59:60 + S Leap 1987 Dec 31 23:59:60 + S Leap 1989 Dec 31 23:59:60 + S Leap 1990 Dec 31 23:59:60 + S Leap 1992 Jun 30 23:59:60 + S Leap 1993 Jun 30 23:59:60 + S Leap 1994 Jun 30 23:59:60 + S Leap 1995 Dec 31 23:59:60 + S Leap 1997 Jun 30 23:59:60 + S Leap 1998 Dec 31 23:59:60 + S
84701a2007-02-01Henrik Grubbström (Grubba) Leap 2005 Dec 31 23:59:60 + S
ecc1102009-03-20Henrik Grubbström (Grubba) Leap 2008 Dec 31 23:59:60 + S
2440ca2003-03-30Mirar (Pontus Hagland) 
ca883b2008-04-03Henrik Grubbström (Grubba) # INTERNATIONAL EARTH ROTATION AND REFERENCE SYSTEMS SERVICE (IERS) #
84701a2007-02-01Henrik Grubbström (Grubba) # SERVICE INTERNATIONAL DE LA ROTATION TERRESTRE ET DES SYSTEMES DE REFERENCE
ca883b2008-04-03Henrik Grubbström (Grubba) #
2440ca2003-03-30Mirar (Pontus Hagland) # SERVICE DE LA ROTATION TERRESTRE
ecc1102009-03-20Henrik Grubbström (Grubba) # OBSERVATOIRE DE PARIS
2440ca2003-03-30Mirar (Pontus Hagland) # 61, Av. de l'Observatoire 75014 PARIS (France)
abd0a42009-11-15Henrik Grubbström (Grubba) # Tel. : 33 (0) 1 40 51 22 26
ca883b2008-04-03Henrik Grubbström (Grubba) # FAX : 33 (0) 1 40 51 22 91 # Internet : services.iers@obspm.fr #
abd0a42009-11-15Henrik Grubbström (Grubba) # Paris, 4 July 2009
ca883b2008-04-03Henrik Grubbström (Grubba) #
abd0a42009-11-15Henrik Grubbström (Grubba) # Bulletin C 38
ca883b2008-04-03Henrik Grubbström (Grubba) #
ecc1102009-03-20Henrik Grubbström (Grubba) # To authorities responsible
ca883b2008-04-03Henrik Grubbström (Grubba) # for the measurement and
ecc1102009-03-20Henrik Grubbström (Grubba) # distribution of time
ca883b2008-04-03Henrik Grubbström (Grubba) # # INFORMATION ON UTC - TAI #
abd0a42009-11-15Henrik Grubbström (Grubba) # NO positive leap second will be introduced at the end of December 2009.
6ba2da2007-03-07Martin Nilsson # The difference between Coordinated Universal Time UTC and the
ca883b2008-04-03Henrik Grubbström (Grubba) # International Atomic Time TAI is : #
ecc1102009-03-20Henrik Grubbström (Grubba) # from 2009 January 1, 0h UTC, until further notice : UTC-TAI = -34 s
ca883b2008-04-03Henrik Grubbström (Grubba) # # Leap seconds can be introduced in UTC at the end of the months of December # or June, depending on the evolution of UT1-TAI. Bulletin C is mailed every # six months, either to announce a time step in UTC, or to confirm that there # will be no time step at the next possible date. # # Daniel GAMBIS
abd0a42009-11-15Henrik Grubbström (Grubba) # Director # Earth Orientation Center of IERS
ca883b2008-04-03Henrik Grubbström (Grubba) # Observatoire de Paris, France