1# Allowance for leap seconds added to each time zone file. 2 3# This file is in the public domain. 4 5# This file is generated automatically from the data in the public-domain 6# leap-seconds.list file available from most NIST time servers. 7# If the URL <ftp://time.nist.gov/pub/leap-seconds.list> does not work, 8# you should be able to pick up leap-seconds.list from a secondary NIST server. 9# See <http://tf.nist.gov/tf-cgi/servers.cgi> for a list of secondary servers. 10# For more about leap-seconds.list, please see 11# The NTP Timescale and Leap Seconds 12# http://www.eecis.udel.edu/~mills/leap.html 13 14# The International Earth Rotation and Reference Systems Service 15# periodically uses leap seconds to keep UTC to within 0.9 s of UT1 16# (which measures the true angular orientation of the earth in space); see 17# Terry J Quinn, The BIPM and the accurate measure of time, 18# Proc IEEE 79, 7 (July 1991), 894-905 <http://dx.doi.org/10.1109/5.84965>. 19# There were no leap seconds before 1972, because the official mechanism 20# accounting for the discrepancy between atomic time and the earth's rotation 21# did not exist until the early 1970s. 22 23# The correction (+ or -) is made at the given time, so lines 24# will typically look like: 25# Leap YEAR MON DAY 23:59:60 + R/S 26# or 27# Leap YEAR MON DAY 23:59:59 - R/S 28 29# If the leapsecond is Rolling (R) the given time is local time. 30# If the leapsecond is Stationary (S) the given time is UTC. 31 32# Leap YEAR MONTH DAY HH:MM:SS CORR R/S 33Leap 1972 Jun 30 23:59:60 + S 34Leap 1972 Dec 31 23:59:60 + S 35Leap 1973 Dec 31 23:59:60 + S 36Leap 1974 Dec 31 23:59:60 + S 37Leap 1975 Dec 31 23:59:60 + S 38Leap 1976 Dec 31 23:59:60 + S 39Leap 1977 Dec 31 23:59:60 + S 40Leap 1978 Dec 31 23:59:60 + S 41Leap 1979 Dec 31 23:59:60 + S 42Leap 1981 Jun 30 23:59:60 + S 43Leap 1982 Jun 30 23:59:60 + S 44Leap 1983 Jun 30 23:59:60 + S 45Leap 1985 Jun 30 23:59:60 + S 46Leap 1987 Dec 31 23:59:60 + S 47Leap 1989 Dec 31 23:59:60 + S 48Leap 1990 Dec 31 23:59:60 + S 49Leap 1992 Jun 30 23:59:60 + S 50Leap 1993 Jun 30 23:59:60 + S 51Leap 1994 Jun 30 23:59:60 + S 52Leap 1995 Dec 31 23:59:60 + S 53Leap 1997 Jun 30 23:59:60 + S 54Leap 1998 Dec 31 23:59:60 + S 55Leap 2005 Dec 31 23:59:60 + S 56Leap 2008 Dec 31 23:59:60 + S 57Leap 2012 Jun 30 23:59:60 + S 58Leap 2015 Jun 30 23:59:60 + S 59Leap 2016 Dec 31 23:59:60 + S 60 61# Updated through IERS Bulletin C52 62# File expires on: 28 June 2017 63