82 lines
2.9 KiB
Text
82 lines
2.9 KiB
Text
# @(#)leapseconds 8.3
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# Allowance for leapseconds added to each timezone file.
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# The International Earth Rotation Service periodically uses leap seconds
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# to keep UTC to within 0.9 s of UT1
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# (which measures the true angular orientation of the earth in space); see
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# Terry J Quinn, The BIPM and the accurate measure of time,
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# Proc IEEE 79, 7 (July 1991), 894-905.
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# There were no leap seconds before 1972, because the official mechanism
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# accounting for the discrepancy between atomic time and the earth's rotation
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# did not exist until the early 1970s.
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# The correction (+ or -) is made at the given time, so lines
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# will typically look like:
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# Leap YEAR MON DAY 23:59:60 + R/S
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# or
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# Leap YEAR MON DAY 23:59:59 - R/S
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# If the leapsecond is Rolling (R) the given time is local time
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# If the leapsecond is Stationary (S) the given time is UTC
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# Leap YEAR MONTH DAY HH:MM:SS CORR R/S
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Leap 1972 Jun 30 23:59:60 + S
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Leap 1972 Dec 31 23:59:60 + S
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Leap 1973 Dec 31 23:59:60 + S
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Leap 1974 Dec 31 23:59:60 + S
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Leap 1975 Dec 31 23:59:60 + S
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Leap 1976 Dec 31 23:59:60 + S
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Leap 1977 Dec 31 23:59:60 + S
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Leap 1978 Dec 31 23:59:60 + S
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Leap 1979 Dec 31 23:59:60 + S
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Leap 1981 Jun 30 23:59:60 + S
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Leap 1982 Jun 30 23:59:60 + S
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Leap 1983 Jun 30 23:59:60 + S
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Leap 1985 Jun 30 23:59:60 + S
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Leap 1987 Dec 31 23:59:60 + S
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Leap 1989 Dec 31 23:59:60 + S
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Leap 1990 Dec 31 23:59:60 + S
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Leap 1992 Jun 30 23:59:60 + S
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Leap 1993 Jun 30 23:59:60 + S
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Leap 1994 Jun 30 23:59:60 + S
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Leap 1995 Dec 31 23:59:60 + S
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Leap 1997 Jun 30 23:59:60 + S
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Leap 1998 Dec 31 23:59:60 + S
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Leap 2005 Dec 31 23:59:60 + S
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# ...
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# Sent: Thursday, February 01, 2007 9:49 AM
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# ...
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# Subject: Bulletin C number 33
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#
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# INTERNATIONAL EARTH ROTATION AND REFERENCE SYSTEMS SERVICE (IERS)
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#
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# SERVICE INTERNATIONAL DE LA ROTATION TERRESTRE ET DES SYSTEMES DE REFERENCE
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#
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# SERVICE DE LA ROTATION TERRESTRE
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# OBSERVATOIRE DE PARIS
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# 61, Av. de l'Observatoire 75014 PARIS (France)
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# ...
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#
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# Paris, 1 February 2007
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# Bulletin C 33
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# To authorities responsible
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# for the measurement and
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# distribution of time
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#
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# INFORMATION ON UTC - TAI
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#
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# NO positive leap second will be introduced at the end of June 2007.
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# The difference between Coordinated Universal Time UTC and the
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# International Atomic Time TAI is:
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# from 2006 January 1, 0h UTC, until further notice : UTC-TAI = -33 s
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# Leap seconds can be introduced in UTC at the end of the months of
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# December or June, depending on the evolution of UT1-TAI. Bulletin C is
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# mailed every six months, either to announce a time step in UTC, or to
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# confirm that there will be no time step at the next possible date.
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#
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# Daniel GAMBIS
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# Director
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# Earth Orientation Center of IERS
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# Observatoire de Paris, France
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