leapseconds revision 345670
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, which can be copied from 7# <ftp://ftp.nist.gov/pub/time/leap-seconds.list> 8# or <ftp://ftp.boulder.nist.gov/pub/time/leap-seconds.list> 9# or <ftp://tycho.usno.navy.mil/pub/ntp/leap-seconds.list>. 10# For more about leap-seconds.list, please see 11# The NTP Timescale and Leap Seconds 12# <https://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) 17# and publishes leap second data in a copyrighted file 18# <https://hpiers.obspm.fr/iers/bul/bulc/Leap_Second.dat>. 19# See: Levine J. Coordinated Universal Time and the leap second. 20# URSI Radio Sci Bull. 2016;89(4):30-6. doi:10.23919/URSIRSB.2016.7909995 21# <https://ieeexplore.ieee.org/document/7909995>. 22 23# There were no leap seconds before 1972, because the official mechanism 24# accounting for the discrepancy between atomic time and the earth's rotation 25# did not exist. The first ("1 Jan 1972") data line in leap-seconds.list 26# does not denote a leap second; it denotes the start of the current definition 27# of UTC. 28 29# The correction (+ or -) is made at the given time, so lines 30# will typically look like: 31# Leap YEAR MON DAY 23:59:60 + R/S 32# or 33# Leap YEAR MON DAY 23:59:59 - R/S 34 35# If the leap second is Rolling (R) the given time is local time (unused here). 36Leap 1972 Jun 30 23:59:60 + S 37Leap 1972 Dec 31 23:59:60 + S 38Leap 1973 Dec 31 23:59:60 + S 39Leap 1974 Dec 31 23:59:60 + S 40Leap 1975 Dec 31 23:59:60 + S 41Leap 1976 Dec 31 23:59:60 + S 42Leap 1977 Dec 31 23:59:60 + S 43Leap 1978 Dec 31 23:59:60 + S 44Leap 1979 Dec 31 23:59:60 + S 45Leap 1981 Jun 30 23:59:60 + S 46Leap 1982 Jun 30 23:59:60 + S 47Leap 1983 Jun 30 23:59:60 + S 48Leap 1985 Jun 30 23:59:60 + S 49Leap 1987 Dec 31 23:59:60 + S 50Leap 1989 Dec 31 23:59:60 + S 51Leap 1990 Dec 31 23:59:60 + S 52Leap 1992 Jun 30 23:59:60 + S 53Leap 1993 Jun 30 23:59:60 + S 54Leap 1994 Jun 30 23:59:60 + S 55Leap 1995 Dec 31 23:59:60 + S 56Leap 1997 Jun 30 23:59:60 + S 57Leap 1998 Dec 31 23:59:60 + S 58Leap 2005 Dec 31 23:59:60 + S 59Leap 2008 Dec 31 23:59:60 + S 60Leap 2012 Jun 30 23:59:60 + S 61Leap 2015 Jun 30 23:59:60 + S 62Leap 2016 Dec 31 23:59:60 + S 63 64# POSIX timestamps for the data in this file: 65#updated 1467936000 66#expires 1577491200 67 68# Updated through IERS Bulletin C57 69# File expires on: 28 December 2019 70