leapseconds revision 342668
1287020Sdelphij# Allowance for leap seconds added to each time zone file. 2267460Sedwin 3287020Sdelphij# This file is in the public domain. 42742Swollman 5287020Sdelphij# This file is generated automatically from the data in the public-domain 6339630Sphilip# leap-seconds.list file, which can be copied from 7339630Sphilip# <ftp://ftp.nist.gov/pub/time/leap-seconds.list> 8339630Sphilip# or <ftp://ftp.boulder.nist.gov/pub/time/leap-seconds.list> 9339630Sphilip# or <ftp://tycho.usno.navy.mil/pub/ntp/leap-seconds.list>. 10287020Sdelphij# For more about leap-seconds.list, please see 11287020Sdelphij# The NTP Timescale and Leap Seconds 12339630Sphilip# <https://www.eecis.udel.edu/~mills/leap.html>. 13287020Sdelphij 14287020Sdelphij# The International Earth Rotation and Reference Systems Service 15287020Sdelphij# periodically uses leap seconds to keep UTC to within 0.9 s of UT1 16339630Sphilip# (which measures the true angular orientation of the earth in space) 17339630Sphilip# and publishes leap second data in a copyrighted file 18339630Sphilip# <https://hpiers.obspm.fr/iers/bul/bulc/Leap_Second.dat>. 19339630Sphilip# See: Levine J. Coordinated Universal Time and the leap second. 20325159Sphilip# URSI Radio Sci Bull. 2016;89(4):30-6. doi:10.23919/URSIRSB.2016.7909995 21339630Sphilip# <https://ieeexplore.ieee.org/document/7909995>. 22342668Sphilip 232742Swollman# There were no leap seconds before 1972, because the official mechanism 242742Swollman# accounting for the discrepancy between atomic time and the earth's rotation 25342668Sphilip# did not exist. The first ("1 Jan 1972") data line in leap-seconds.list 26342668Sphilip# does not denote a leap second; it denotes the start of the current definition 27342668Sphilip# of UTC. 282742Swollman 292742Swollman# The correction (+ or -) is made at the given time, so lines 302742Swollman# will typically look like: 312742Swollman# Leap YEAR MON DAY 23:59:60 + R/S 322742Swollman# or 332742Swollman# Leap YEAR MON DAY 23:59:59 - R/S 342742Swollman 35339630Sphilip# If the leap second is Rolling (R) the given time is local time (unused here). 362742SwollmanLeap 1972 Jun 30 23:59:60 + S 372742SwollmanLeap 1972 Dec 31 23:59:60 + S 382742SwollmanLeap 1973 Dec 31 23:59:60 + S 392742SwollmanLeap 1974 Dec 31 23:59:60 + S 402742SwollmanLeap 1975 Dec 31 23:59:60 + S 412742SwollmanLeap 1976 Dec 31 23:59:60 + S 422742SwollmanLeap 1977 Dec 31 23:59:60 + S 432742SwollmanLeap 1978 Dec 31 23:59:60 + S 442742SwollmanLeap 1979 Dec 31 23:59:60 + S 452742SwollmanLeap 1981 Jun 30 23:59:60 + S 462742SwollmanLeap 1982 Jun 30 23:59:60 + S 472742SwollmanLeap 1983 Jun 30 23:59:60 + S 482742SwollmanLeap 1985 Jun 30 23:59:60 + S 492742SwollmanLeap 1987 Dec 31 23:59:60 + S 502742SwollmanLeap 1989 Dec 31 23:59:60 + S 512742SwollmanLeap 1990 Dec 31 23:59:60 + S 522742SwollmanLeap 1992 Jun 30 23:59:60 + S 532742SwollmanLeap 1993 Jun 30 23:59:60 + S 542742SwollmanLeap 1994 Jun 30 23:59:60 + S 5539871SphkLeap 1995 Dec 31 23:59:60 + S 5639871SphkLeap 1997 Jun 30 23:59:60 + S 5739898SphkLeap 1998 Dec 31 23:59:60 + S 58147771SphkLeap 2005 Dec 31 23:59:60 + S 59181424SedwinLeap 2008 Dec 31 23:59:60 + S 60233445SedwinLeap 2012 Jun 30 23:59:60 + S 61287020SdelphijLeap 2015 Jun 30 23:59:60 + S 62307361SbaptLeap 2016 Dec 31 23:59:60 + S 63267460Sedwin 64339630Sphilip# POSIX timestamps for the data in this file: 65339630Sphilip#updated 1467936000 66339630Sphilip#expires 1561680000 67339630Sphilip 68339630Sphilip# Updated through IERS Bulletin C56 69339630Sphilip# File expires on: 28 June 2019 70