1 1.2 kre # 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 1.7 kre # NIST/IERS format leap-seconds.list file, which can be copied from 7 1.2 kre # <https://hpiers.obspm.fr/iers/bul/bulc/ntp/leap-seconds.list> 8 1.10 kre # or via a less-secure protocol and with different comments and 9 1.10 kre # less volatile last-modified and expiration timestamps, from 10 1.7 kre # <ftp://ftp.boulder.nist.gov/pub/time/leap-seconds.list>. 11 1.1 apb # For more about leap-seconds.list, please see 12 1.1 apb # The NTP Timescale and Leap Seconds 13 1.2 kre # <https://www.eecis.udel.edu/~mills/leap.html>. 14 1.1 apb 15 1.2 kre # The rules for leap seconds are specified in Annex 1 (Time scales) of: 16 1.2 kre # Standard-frequency and time-signal emissions. 17 1.2 kre # International Telecommunication Union - Radiocommunication Sector 18 1.2 kre # (ITU-R) Recommendation TF.460-6 (02/2002) 19 1.2 kre # <https://www.itu.int/rec/R-REC-TF.460-6-200202-I/>. 20 1.2 kre # The International Earth Rotation and Reference Systems Service (IERS) 21 1.2 kre # periodically uses leap seconds to keep UTC to within 0.9 s of UT1 22 1.2 kre # (a proxy for Earth's angle in space as measured by astronomers) 23 1.2 kre # and publishes leap second data in a copyrighted file 24 1.2 kre # <https://hpiers.obspm.fr/iers/bul/bulc/Leap_Second.dat>. 25 1.2 kre # See: Levine J. Coordinated Universal Time and the leap second. 26 1.2 kre # URSI Radio Sci Bull. 2016;89(4):30-6. doi:10.23919/URSIRSB.2016.7909995 27 1.2 kre # <https://ieeexplore.ieee.org/document/7909995>. 28 1.2 kre 29 1.2 kre # There were no leap seconds before 1972, as no official mechanism 30 1.2 kre # accounted for the discrepancy between atomic time (TAI) and the earth's 31 1.2 kre # rotation. The first ("1 Jan 1972") data line in leap-seconds.list 32 1.2 kre # does not denote a leap second; it denotes the start of the current definition 33 1.2 kre # of UTC. 34 1.2 kre 35 1.2 kre # All leap-seconds are Stationary (S) at the given UTC time. 36 1.2 kre # The correction (+ or -) is made at the given time, so in the unlikely 37 1.2 kre # event of a negative leap second, a line would look like this: 38 1.2 kre # Leap YEAR MON DAY 23:59:59 - S 39 1.2 kre # Typical lines look like this: 40 1.2 kre # Leap YEAR MON DAY 23:59:60 + S 41 1.1 apb Leap 1972 Jun 30 23:59:60 + S 42 1.1 apb Leap 1972 Dec 31 23:59:60 + S 43 1.1 apb Leap 1973 Dec 31 23:59:60 + S 44 1.1 apb Leap 1974 Dec 31 23:59:60 + S 45 1.1 apb Leap 1975 Dec 31 23:59:60 + S 46 1.1 apb Leap 1976 Dec 31 23:59:60 + S 47 1.1 apb Leap 1977 Dec 31 23:59:60 + S 48 1.1 apb Leap 1978 Dec 31 23:59:60 + S 49 1.1 apb Leap 1979 Dec 31 23:59:60 + S 50 1.1 apb Leap 1981 Jun 30 23:59:60 + S 51 1.1 apb Leap 1982 Jun 30 23:59:60 + S 52 1.1 apb Leap 1983 Jun 30 23:59:60 + S 53 1.1 apb Leap 1985 Jun 30 23:59:60 + S 54 1.1 apb Leap 1987 Dec 31 23:59:60 + S 55 1.1 apb Leap 1989 Dec 31 23:59:60 + S 56 1.1 apb Leap 1990 Dec 31 23:59:60 + S 57 1.1 apb Leap 1992 Jun 30 23:59:60 + S 58 1.1 apb Leap 1993 Jun 30 23:59:60 + S 59 1.1 apb Leap 1994 Jun 30 23:59:60 + S 60 1.1 apb Leap 1995 Dec 31 23:59:60 + S 61 1.1 apb Leap 1997 Jun 30 23:59:60 + S 62 1.1 apb Leap 1998 Dec 31 23:59:60 + S 63 1.1 apb Leap 2005 Dec 31 23:59:60 + S 64 1.1 apb Leap 2008 Dec 31 23:59:60 + S 65 1.1 apb Leap 2012 Jun 30 23:59:60 + S 66 1.2 kre Leap 2015 Jun 30 23:59:60 + S 67 1.2 kre Leap 2016 Dec 31 23:59:60 + S 68 1.2 kre 69 1.2 kre # UTC timestamp when this leap second list expires. 70 1.2 kre # Any additional leap seconds will come after this. 71 1.2 kre # This Expires line is commented out for now, 72 1.2 kre # so that pre-2020a zic implementations do not reject this file. 73 1.12 kre #Expires 2027 Jun 28 00:00:00 74 1.2 kre 75 1.10 kre # Here are POSIX timestamps for the data in this file. 76 1.10 kre # "#updated" gives the last time the leap seconds data changed 77 1.10 kre # or, if this file was derived from the IERS leap-seconds.list, 78 1.10 kre # the last time that file changed in any way. 79 1.10 kre # "#expires" gives the first time this file might be wrong; 80 1.10 kre # if this file was derived from the IERS leap-seconds.list, 81 1.10 kre # this is typically a bit less than one year after "updated". 82 1.12 kre #updated 1783323897 (2026-07-06 07:44:57 UTC) 83 1.12 kre #expires 1814140800 (2027-06-28 00:00:00 UTC) 84 1.2 kre 85 1.7 kre # Updated through IERS Bulletin C (https://hpiers.obspm.fr/iers/bul/bulc/bulletinc.dat) 86 1.12 kre # File expires on 28 June 2027 87
Indexes created Sun Aug 16 00:25:19 UTC 2026