Differences TAI-UTC from IERS Bulletin C. The leap second is introduced at the beginning of the day reported. The last value of the file is not used; the corresponding date defines the limit of validity of the file. WARNING: this file should be updated periodically by the user, for instance by consulting http://hpiers.obspm.fr/iers/bul/bulc/bulletinc.dat The present version of the file is updated through Bulletin C52 (Jul 06, 2016) Day, month, year, TAI-UTC (s) --------------------------------------------------- 1 1 1972 10 1 7 1972 11 1 1 1973 12 1 1 1974 13 1 1 1975 14 1 1 1976 15 1 1 1977 16 1 1 1978 17 1 1 1979 18 1 1 1980 19 1 7 1981 20 1 7 1982 21 1 7 1983 22 1 7 1985 23 1 1 1988 24 1 1 1990 25 1 1 1991 26 1 7 1992 27 1 7 1993 28 1 7 1994 29 1 1 1996 30 1 7 1997 31 1 1 1999 32 1 1 2006 33 1 1 2009 34 1 7 2012 35 1 7 2015 36 1 1 2017 37 1 1 2100 37