leapseconds revision 1.1.1.6
1 1.1.1.2 apb # Allowance for leap seconds added to each time zone file. 2 1.1 apb 3 1.1 apb # This file is in the public domain. 4 1.1 apb 5 1.1 apb # This file is generated automatically from the data in the public-domain 6 1.1 apb # leap-seconds.list file available from most NIST time servers. 7 1.1 apb # If the URL <ftp://time.nist.gov/pub/leap-seconds.list> does not work, 8 1.1 apb # you should be able to pick up leap-seconds.list from a secondary NIST server. 9 1.1.1.6 christos # See <http://tf.nist.gov/tf-cgi/servers.cgi> for a list of secondary servers. 10 1.1 apb # For more about leap-seconds.list, please see 11 1.1 apb # The NTP Timescale and Leap Seconds 12 1.1.1.2 apb # http://www.eecis.udel.edu/~mills/leap.html 13 1.1 apb 14 1.1.1.3 apb # The International Earth Rotation and Reference Systems Service 15 1.1.1.3 apb # periodically uses leap seconds to keep UTC to within 0.9 s of UT1 16 1.1 apb # (which measures the true angular orientation of the earth in space); see 17 1.1 apb # Terry J Quinn, The BIPM and the accurate measure of time, 18 1.1 apb # Proc IEEE 79, 7 (July 1991), 894-905 <http://dx.doi.org/10.1109/5.84965>. 19 1.1 apb # There were no leap seconds before 1972, because the official mechanism 20 1.1 apb # accounting for the discrepancy between atomic time and the earth's rotation 21 1.1 apb # did not exist until the early 1970s. 22 1.1 apb 23 1.1 apb # The correction (+ or -) is made at the given time, so lines 24 1.1 apb # will typically look like: 25 1.1 apb # Leap YEAR MON DAY 23:59:60 + R/S 26 1.1 apb # or 27 1.1 apb # Leap YEAR MON DAY 23:59:59 - R/S 28 1.1 apb 29 1.1 apb # If the leapsecond is Rolling (R) the given time is local time. 30 1.1 apb # If the leapsecond is Stationary (S) the given time is UTC. 31 1.1 apb 32 1.1 apb # Leap YEAR MONTH DAY HH:MM:SS CORR R/S 33 1.1 apb Leap 1972 Jun 30 23:59:60 + S 34 1.1 apb Leap 1972 Dec 31 23:59:60 + S 35 1.1 apb Leap 1973 Dec 31 23:59:60 + S 36 1.1 apb Leap 1974 Dec 31 23:59:60 + S 37 1.1 apb Leap 1975 Dec 31 23:59:60 + S 38 1.1 apb Leap 1976 Dec 31 23:59:60 + S 39 1.1 apb Leap 1977 Dec 31 23:59:60 + S 40 1.1 apb Leap 1978 Dec 31 23:59:60 + S 41 1.1 apb Leap 1979 Dec 31 23:59:60 + S 42 1.1 apb Leap 1981 Jun 30 23:59:60 + S 43 1.1 apb Leap 1982 Jun 30 23:59:60 + S 44 1.1 apb Leap 1983 Jun 30 23:59:60 + S 45 1.1 apb Leap 1985 Jun 30 23:59:60 + S 46 1.1 apb Leap 1987 Dec 31 23:59:60 + S 47 1.1 apb Leap 1989 Dec 31 23:59:60 + S 48 1.1 apb Leap 1990 Dec 31 23:59:60 + S 49 1.1 apb Leap 1992 Jun 30 23:59:60 + S 50 1.1 apb Leap 1993 Jun 30 23:59:60 + S 51 1.1 apb Leap 1994 Jun 30 23:59:60 + S 52 1.1 apb Leap 1995 Dec 31 23:59:60 + S 53 1.1 apb Leap 1997 Jun 30 23:59:60 + S 54 1.1 apb Leap 1998 Dec 31 23:59:60 + S 55 1.1 apb Leap 2005 Dec 31 23:59:60 + S 56 1.1 apb Leap 2008 Dec 31 23:59:60 + S 57 1.1 apb Leap 2012 Jun 30 23:59:60 + S 58 1.1.1.4 apb Leap 2015 Jun 30 23:59:60 + S 59 1.1.1.4 apb 60 1.1.1.6 christos # Updated through IERS Bulletin C51 61 1.1.1.6 christos # File expires on: 28 December 2016 62
Indexes created Tue Aug 18 00:25:06 UTC 2026