| # Allowance for leap seconds added to each time zone file. | |
| # This file is in the public domain. | |
| # This file is generated automatically from the data in the public-domain | |
| # NIST/IERS format leap-seconds.list file, which can be copied from | |
| # <https://hpiers.obspm.fr/iers/bul/bulc/ntp/leap-seconds.list> | |
| # or, in a variant with different comments, from | |
| # <ftp://ftp.boulder.nist.gov/pub/time/leap-seconds.list>. | |
| # For more about leap-seconds.list, please see | |
| # The NTP Timescale and Leap Seconds | |
| # <https://www.eecis.udel.edu/~mills/leap.html>. | |
| # The rules for leap seconds are specified in Annex 1 (Time scales) of: | |
| # Standard-frequency and time-signal emissions. | |
| # International Telecommunication Union - Radiocommunication Sector | |
| # (ITU-R) Recommendation TF.460-6 (02/2002) | |
| # <https://www.itu.int/rec/R-REC-TF.460-6-200202-I/>. | |
| # The International Earth Rotation and Reference Systems Service (IERS) | |
| # periodically uses leap seconds to keep UTC to within 0.9 s of UT1 | |
| # (a proxy for Earth's angle in space as measured by astronomers) | |
| # 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. | |
| # URSI Radio Sci Bull. 2016;89(4):30-6. doi:10.23919/URSIRSB.2016.7909995 | |
| # <https://ieeexplore.ieee.org/document/7909995>. | |
| # There were no leap seconds before 1972, as no official mechanism | |
| # accounted for the discrepancy between atomic time (TAI) and the earth's | |
| # rotation. 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. | |
| # All leap-seconds are Stationary (S) at the given UTC time. | |
| # The correction (+ or -) is made at the given time, so in the unlikely | |
| # event of a negative leap second, a line would look like this: | |
| # Leap YEAR MON DAY 23:59:59 - S | |
| # Typical lines look like this: | |
| # Leap YEAR MON DAY 23:59:60 + S | |
| 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 | |
| Leap 2005 Dec 31 23:59:60 + S | |
| Leap 2008 Dec 31 23:59:60 + S | |
| Leap 2012 Jun 30 23:59:60 + S | |
| Leap 2015 Jun 30 23:59:60 + S | |
| Leap 2016 Dec 31 23:59:60 + S | |
| # UTC timestamp when this leap second list expires. | |
| # Any additional leap seconds will come after this. | |
| # This Expires line is commented out for now, | |
| # so that pre-2020a zic implementations do not reject this file. | |
| #Expires 2025 Dec 28 00:00:00 | |
| # POSIX timestamps for the data in this file: | |
| #updated 1736208000 (2025-01-07 00:00:00 UTC) | |
| #expires 1766880000 (2025-12-28 00:00:00 UTC) | |
| # Updated through IERS Bulletin C (https://hpiers.obspm.fr/iers/bul/bulc/bulletinc.dat) | |
| # File expires on 28 December 2025 | |