--------------- UTC-TAI.history --------------- RELATIONSHIP BETWEEN TAI AND UTC ------------------------------------------------------------------------------- Limits of validity(at 0h UTC) TAI - UTC 1961 Jan. 1 - 1961 Aug. 1 1.422 818 0s + (MJD - 37 300) x 0.001 296s Aug. 1 - 1962 Jan. 1 1.372 818 0s + "" 1962 Jan. 1 - 1963 Nov. 1 1.845 858 0s + (MJD - 37 665) x 0.001 123 2s 1963 Nov. 1 - 1964 Jan. 1 1.945 858 0s + "" 1964 Jan. 1 - April 1 3.240 130 0s + (MJD - 38 761) x 0.001 296s April 1 - Sept. 1 3.340 130 0s + "" Sept. 1 - 1965 Jan. 1 3.440 130 0s + "" 1965 Jan. 1 - March 1 3.540 130 0s + "" March 1 - Jul. 1 3.640 130 0s + "" Jul. 1 - Sept. 1 3.740 130 0s + "" Sept. 1 - 1966 Jan. 1 3.840 130 0s + "" 1966 Jan. 1 - 1968 Feb. 1 4.313 170 0s + (MJD - 39 126) x 0.002 592s 1968 Feb. 1 - 1972 Jan. 1 4.213 170 0s + "" 1972 Jan. 1 - Jul. 1 10s Jul. 1 - 1973 Jan. 1 11s 1973 Jan. 1 - 1974 Jan. 1 12s 1974 Jan. 1 - 1975 Jan. 1 13s 1975 Jan. 1 - 1976 Jan. 1 14s 1976 Jan. 1 - 1977 Jan. 1 15s 1977 Jan. 1 - 1978 Jan. 1 16s 1978 Jan. 1 - 1979 Jan. 1 17s 1979 Jan. 1 - 1980 Jan. 1 18s 1980 Jan. 1 - 1981 Jul. 1 19s 1981 Jul. 1 - 1982 Jul. 1 20s 1982 Jul. 1 - 1983 Jul. 1 21s 1983 Jul. 1 - 1985 Jul. 1 22s 1985 Jul. 1 - 1988 Jan. 1 23s 1988 Jan. 1 - 1990 Jan. 1 24s 1990 Jan. 1 - 1991 Jan. 1 25s 1991 Jan. 1 - 1992 Jul. 1 26s 1992 Jul. 1.- 1993 Jul 1 27s 1993 Jul. 1 - 1994 Jul. 1 28s 1994 Jul. 1 - 1996 Jan. 1 29s 1996 Jan. 1 - 1997 Jul. 1 30s 1997 Jul. 1.- 1999 Jan. 1 31s 1999 Jan. 1.- 2006 Jan. 1 32s 2006 Jan. 1.- 2009 Jan. 1 33s 2009 Jan. 1.- 2012 Jul 1 34s 2012 Jul. 1 - 2015 Jul 1 35s 2015 Jul. 1 - 2017 Jan 1 36s 2017 Jan. 1 - 37s ----------------------------------------------------------------------