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- # <pre>
- # 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
- Leap 2012 Jun 30 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 26
- # FAX : 33 (0) 1 40 51 22 91
- # e-mail : (E-Mail Removed)
- # http://hpiers.obspm.fr/eop-pc
- #
- # Paris, 5 January 2012
- #
- #
- # Bulletin C 43
- #
- # To authorities responsible
- # for the measurement and
- # distribution of time
- #
- #
- # UTC TIME STEP
- # on the 1st of July 2012
- #
- #
- # A positive leap second will be introduced at the end of June 2012.
- # The sequence of dates of the UTC second markers will be:
- #
- # 2012 June 30, 23h 59m 59s
- # 2012 June 30, 23h 59m 60s
- # 2012 July 1, 0h 0m 0s
- #
- # The difference between UTC and the International Atomic Time TAI is:
- #
- # from 2009 January 1, 0h UTC, to 2012 July 1 0h UTC : UTC-TAI = - 34s
- # from 2012 July 1, 0h UTC, until further notice : UTC-TAI = - 35s
- #
- # 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 IERS
- # Observatoire de Paris, France
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