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    Historical list of leap seconds since 1972


    Date Introduced

    +ve/-ve leap second

    TAI - UTC (seconds)

    1 Jan 1972 +ve 10.0
    1 Jul 1972 +ve 11.0
    1 Jan 1973 +ve 12.0
    1 Jan 1974 +ve 13.0
    1 Jan 1975 +ve 14.0
    1 Jan 1976 +ve 15.0
    1 Jan 1977 +ve 16.0
    1 Jan 1978 +ve 17.0
    1 Jan 1979 +ve 18.0
    1 Jan 1980 +ve 19.0
    1 Jul 1981 +ve 20.0
    1 Jul 1982 +ve 21.0
    1 Jul 1983 +ve 22.0
    1 Jul 1985 +ve 23.0
    1 Jan 1988 +ve 24.0
    1 Jan 1990 +ve 25.0
    1 Jan 1991 +ve 26.0
    1 Jul 1992 +ve 27.0
    1 Jul 1993 +ve 28.0
    1 Jul 1994 +ve 29.0
    1 Jan 1996 +ve 30.0
    1 Jul 1997 +ve 31.0
    1 Jan 1999 +ve 32.0
    1 Jan 2006 +ve 33.0
    1 Jan 2009 +ve 34.0
    1 Jul 2012 +ve 35.0
    1 Jul 2015 +ve 36.0
    1 Jan 2017 +ve 37.0
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