1e27ed2014-09-04Henrik Grubbström (Grubba) # Allowance for leap seconds added to each time zone file.
c0dbee2000-08-01Mirar (Pontus Hagland) 
93f75a2013-11-21Henrik Grubbström (Grubba) # This file is in the public domain. # This file is generated automatically from the data in the public-domain
aa9f722018-12-18Henrik Grubbström (Grubba) # leap-seconds.list file, which can be copied from # <ftp://ftp.nist.gov/pub/time/leap-seconds.list> # or <ftp://ftp.boulder.nist.gov/pub/time/leap-seconds.list> # or <ftp://tycho.usno.navy.mil/pub/ntp/leap-seconds.list>.
93f75a2013-11-21Henrik Grubbström (Grubba) # For more about leap-seconds.list, please see # The NTP Timescale and Leap Seconds
aa9f722018-12-18Henrik Grubbström (Grubba) # <https://www.eecis.udel.edu/~mills/leap.html>.
93f75a2013-11-21Henrik Grubbström (Grubba) 
cf65c72014-11-13Henrik Grubbström (Grubba) # The International Earth Rotation and Reference Systems Service # periodically uses leap seconds to keep UTC to within 0.9 s of UT1
aa9f722018-12-18Henrik Grubbström (Grubba) # (which measures the true angular orientation of the earth in space) # and publishes leap second data in a copyrighted file # <https://hpiers.obspm.fr/iers/bul/bulc/Leap_Second.dat>. # See: Levine J. Coordinated Universal Time and the leap second.
af92cb2017-11-17Henrik Grubbström (Grubba) # URSI Radio Sci Bull. 2016;89(4):30-6. doi:10.23919/URSIRSB.2016.7909995
aa9f722018-12-18Henrik Grubbström (Grubba) # <https://ieeexplore.ieee.org/document/7909995>.
36e21c2019-01-08Henrik Grubbström (Grubba) 
c0dbee2000-08-01Mirar (Pontus Hagland) # There were no leap seconds before 1972, because the official mechanism # accounting for the discrepancy between atomic time and the earth's rotation
36e21c2019-01-08Henrik Grubbström (Grubba) # did not exist. The first ("1 Jan 1972") data line in leap-seconds.list # does not denote a leap second; it denotes the start of the current definition # of UTC.
c0dbee2000-08-01Mirar (Pontus Hagland)  # The correction (+ or -) is made at the given time, so lines # will typically look like: # Leap YEAR MON DAY 23:59:60 + R/S # or # Leap YEAR MON DAY 23:59:59 - R/S
aa9f722018-12-18Henrik Grubbström (Grubba) # If the leap second is Rolling (R) the given time is local time (unused here).
c0dbee2000-08-01Mirar (Pontus Hagland) Leap 1972 Jun 30 23:59:60 + S Leap 1972 Dec 31 23:59:60 + S Leap 1973 Dec 31 23:59:60 + S Leap 1974 Dec 31 23:59:60 + S Leap 1975 Dec 31 23:59:60 + S Leap 1976 Dec 31 23:59:60 + S Leap 1977 Dec 31 23:59:60 + S Leap 1978 Dec 31 23:59:60 + S Leap 1979 Dec 31 23:59:60 + S Leap 1981 Jun 30 23:59:60 + S Leap 1982 Jun 30 23:59:60 + S Leap 1983 Jun 30 23:59:60 + S Leap 1985 Jun 30 23:59:60 + S Leap 1987 Dec 31 23:59:60 + S Leap 1989 Dec 31 23:59:60 + S Leap 1990 Dec 31 23:59:60 + S Leap 1992 Jun 30 23:59:60 + S Leap 1993 Jun 30 23:59:60 + S Leap 1994 Jun 30 23:59:60 + S Leap 1995 Dec 31 23:59:60 + S Leap 1997 Jun 30 23:59:60 + S Leap 1998 Dec 31 23:59:60 + S
84701a2007-02-01Henrik Grubbström (Grubba) Leap 2005 Dec 31 23:59:60 + S
ecc1102009-03-20Henrik Grubbström (Grubba) Leap 2008 Dec 31 23:59:60 + S
03d5bb2012-04-28Henrik Grubbström (Grubba) Leap 2012 Jun 30 23:59:60 + S
26c3972015-02-14Henrik Grubbström (Grubba) Leap 2015 Jun 30 23:59:60 + S
dcfe412016-10-23Henrik Grubbström (Grubba) Leap 2016 Dec 31 23:59:60 + S
26c3972015-02-14Henrik Grubbström (Grubba) 
aa9f722018-12-18Henrik Grubbström (Grubba) # POSIX timestamps for the data in this file: #updated 1467936000
59b4e02019-05-06Henrik Grubbström (Grubba) #expires 1577491200
aa9f722018-12-18Henrik Grubbström (Grubba) 
59b4e02019-05-06Henrik Grubbström (Grubba) # Updated through IERS Bulletin C57 # File expires on: 28 December 2019