83 lines
3.3 KiB
Plaintext
83 lines
3.3 KiB
Plaintext
# Allowance for leap seconds added to each time zone file.
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# This file is in the public domain.
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# This file is generated automatically from the data in the public-domain
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# NIST format leap-seconds.list file, which can be copied from
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# <ftp://ftp.nist.gov/pub/time/leap-seconds.list>
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# or <ftp://ftp.boulder.nist.gov/pub/time/leap-seconds.list>.
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# The NIST file is used instead of its IERS upstream counterpart
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# <https://hpiers.obspm.fr/iers/bul/bulc/ntp/leap-seconds.list>
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# because under US law the NIST file is public domain
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# whereas the IERS file's copyright and license status is unclear.
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# For more about leap-seconds.list, please see
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# The NTP Timescale and Leap Seconds
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# <https://www.eecis.udel.edu/~mills/leap.html>.
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# The rules for leap seconds are specified in Annex 1 (Time scales) of:
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# Standard-frequency and time-signal emissions.
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# International Telecommunication Union - Radiocommunication Sector
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# (ITU-R) Recommendation TF.460-6 (02/2002)
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# <https://www.itu.int/rec/R-REC-TF.460-6-200202-I/>.
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# The International Earth Rotation and Reference Systems Service (IERS)
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# periodically uses leap seconds to keep UTC to within 0.9 s of UT1
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# (a proxy for Earth's angle in space as measured by astronomers)
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# and publishes leap second data in a copyrighted file
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# <https://hpiers.obspm.fr/iers/bul/bulc/Leap_Second.dat>.
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# See: Levine J. Coordinated Universal Time and the leap second.
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# URSI Radio Sci Bull. 2016;89(4):30-6. doi:10.23919/URSIRSB.2016.7909995
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# <https://ieeexplore.ieee.org/document/7909995>.
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# There were no leap seconds before 1972, as no official mechanism
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# accounted for the discrepancy between atomic time (TAI) and the earth's
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# rotation. The first ("1 Jan 1972") data line in leap-seconds.list
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# does not denote a leap second; it denotes the start of the current definition
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# of UTC.
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# All leap-seconds are Stationary (S) at the given UTC time.
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# The correction (+ or -) is made at the given time, so in the unlikely
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# event of a negative leap second, a line would look like this:
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# Leap YEAR MON DAY 23:59:59 - S
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# Typical lines look like this:
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# Leap YEAR MON DAY 23:59:60 + S
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Leap 1972 Jun 30 23:59:60 + S
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Leap 1972 Dec 31 23:59:60 + S
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Leap 1973 Dec 31 23:59:60 + S
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Leap 1974 Dec 31 23:59:60 + S
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Leap 1975 Dec 31 23:59:60 + S
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Leap 1976 Dec 31 23:59:60 + S
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Leap 1977 Dec 31 23:59:60 + S
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Leap 1978 Dec 31 23:59:60 + S
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Leap 1979 Dec 31 23:59:60 + S
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Leap 1981 Jun 30 23:59:60 + S
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Leap 1982 Jun 30 23:59:60 + S
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Leap 1983 Jun 30 23:59:60 + S
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Leap 1985 Jun 30 23:59:60 + S
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Leap 1987 Dec 31 23:59:60 + S
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Leap 1989 Dec 31 23:59:60 + S
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Leap 1990 Dec 31 23:59:60 + S
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Leap 1992 Jun 30 23:59:60 + S
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Leap 1993 Jun 30 23:59:60 + S
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Leap 1994 Jun 30 23:59:60 + S
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Leap 1995 Dec 31 23:59:60 + S
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Leap 1997 Jun 30 23:59:60 + S
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Leap 1998 Dec 31 23:59:60 + S
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Leap 2005 Dec 31 23:59:60 + S
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Leap 2008 Dec 31 23:59:60 + S
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Leap 2012 Jun 30 23:59:60 + S
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Leap 2015 Jun 30 23:59:60 + S
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Leap 2016 Dec 31 23:59:60 + S
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# UTC timestamp when this leap second list expires.
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# Any additional leap seconds will come after this.
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# This Expires line is commented out for now,
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# so that pre-2020a zic implementations do not reject this file.
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#Expires 2021 Dec 28 00:00:00
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# POSIX timestamps for the data in this file:
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#updated 1467936000 (2016-07-08 00:00:00 UTC)
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#expires 1640649600 (2021-12-28 00:00:00 UTC)
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# Updated through IERS Bulletin C61
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# File expires on: 28 December 2021
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