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- # 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 format 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>.
- # The NIST file is used instead of its IERS upstream counterpart
- # <https://hpiers.obspm.fr/iers/bul/bulc/ntp/leap-seconds.list>
- # because under US law the NIST file is public domain
- # whereas the IERS file's copyright and license status is unclear.
- # 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 2021 Dec 28 00:00:00
- # POSIX timestamps for the data in this file:
- #updated 1467936000 (2016-07-08 00:00:00 UTC)
- #expires 1640649600 (2021-12-28 00:00:00 UTC)
- # Updated through IERS Bulletin C61
- # File expires on: 28 December 2021
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