| # <pre> |
| # @(#)leapseconds 8.8 |
| # This file is in the public domain, so clarified as of |
| # 2009-05-17 by Arthur David Olson. |
| |
| # 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 |
| Leap 2005 Dec 31 23:59:60 + S |
| Leap 2008 Dec 31 23:59:60 + S |
| |
| # INTERNATIONAL EARTH ROTATION AND REFERENCE SYSTEMS SERVICE (IERS) |
| # |
| # SERVICE INTERNATIONAL DE LA ROTATION TERRESTRE ET DES SYSTEMES DE REFERENCE |
| # |
| # SERVICE DE LA ROTATION TERRESTRE |
| # OBSERVATOIRE DE PARIS |
| # 61, Av. de l'Observatoire 75014 PARIS (France) |
| # Tel. : 33 (0) 1 40 51 22 29 |
| # FAX : 33 (0) 1 40 51 22 91 |
| # Internet : services.iers@obspm.fr |
| # |
| # Paris, 15 January 2009 |
| # |
| # Bulletin C 37 |
| # |
| # To authorities responsible |
| # for the measurement and |
| # distribution of time |
| # |
| # INFORMATION ON UTC - TAI |
| # |
| # NO positive leap second will be introduced at the end of June 2009. |
| # The difference between Coordinated Universal Time UTC and the |
| # International Atomic Time TAI is : |
| # |
| # from 2009 January 1, 0h UTC, until further notice : UTC-TAI = -34 s |
| # |
| # 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 |
| # Head |
| # Earth Orientation Center of the IERS |
| # Observatoire de Paris, France |
