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| 1 | +# Allowance for leap seconds added to each time zone file. |
| 2 | + |
| 3 | +# This file is in the public domain. |
| 4 | + |
| 5 | +# This file is generated automatically from the data in the public-domain |
| 6 | +# NIST/IERS format leap-seconds.list file, which can be copied from |
| 7 | +# <https://hpiers.obspm.fr/iers/bul/bulc/ntp/leap-seconds.list> |
| 8 | +# or, in a variant with different comments, from |
| 9 | +# <ftp://ftp.boulder.nist.gov/pub/time/leap-seconds.list>. |
| 10 | +# For more about leap-seconds.list, please see |
| 11 | +# The NTP Timescale and Leap Seconds |
| 12 | +# <https://www.eecis.udel.edu/~mills/leap.html>. |
| 13 | + |
| 14 | +# The rules for leap seconds are specified in Annex 1 (Time scales) of: |
| 15 | +# Standard-frequency and time-signal emissions. |
| 16 | +# International Telecommunication Union - Radiocommunication Sector |
| 17 | +# (ITU-R) Recommendation TF.460-6 (02/2002) |
| 18 | +# <https://www.itu.int/rec/R-REC-TF.460-6-200202-I/>. |
| 19 | +# The International Earth Rotation and Reference Systems Service (IERS) |
| 20 | +# periodically uses leap seconds to keep UTC to within 0.9 s of UT1 |
| 21 | +# (a proxy for Earth's angle in space as measured by astronomers) |
| 22 | +# and publishes leap second data in a copyrighted file |
| 23 | +# <https://hpiers.obspm.fr/iers/bul/bulc/Leap_Second.dat>. |
| 24 | +# See: Levine J. Coordinated Universal Time and the leap second. |
| 25 | +# URSI Radio Sci Bull. 2016;89(4):30-6. doi:10.23919/URSIRSB.2016.7909995 |
| 26 | +# <https://ieeexplore.ieee.org/document/7909995>. |
| 27 | + |
| 28 | +# There were no leap seconds before 1972, as no official mechanism |
| 29 | +# accounted for the discrepancy between atomic time (TAI) and the earth's |
| 30 | +# rotation. The first ("1 Jan 1972") data line in leap-seconds.list |
| 31 | +# does not denote a leap second; it denotes the start of the current definition |
| 32 | +# of UTC. |
| 33 | + |
| 34 | +# All leap-seconds are Stationary (S) at the given UTC time. |
| 35 | +# The correction (+ or -) is made at the given time, so in the unlikely |
| 36 | +# event of a negative leap second, a line would look like this: |
| 37 | +# Leap YEAR MON DAY 23:59:59 - S |
| 38 | +# Typical lines look like this: |
| 39 | +# Leap YEAR MON DAY 23:59:60 + S |
| 40 | +Leap 1972 Jun 30 23:59:60 + S |
| 41 | +Leap 1972 Dec 31 23:59:60 + S |
| 42 | +Leap 1973 Dec 31 23:59:60 + S |
| 43 | +Leap 1974 Dec 31 23:59:60 + S |
| 44 | +Leap 1975 Dec 31 23:59:60 + S |
| 45 | +Leap 1976 Dec 31 23:59:60 + S |
| 46 | +Leap 1977 Dec 31 23:59:60 + S |
| 47 | +Leap 1978 Dec 31 23:59:60 + S |
| 48 | +Leap 1979 Dec 31 23:59:60 + S |
| 49 | +Leap 1981 Jun 30 23:59:60 + S |
| 50 | +Leap 1982 Jun 30 23:59:60 + S |
| 51 | +Leap 1983 Jun 30 23:59:60 + S |
| 52 | +Leap 1985 Jun 30 23:59:60 + S |
| 53 | +Leap 1987 Dec 31 23:59:60 + S |
| 54 | +Leap 1989 Dec 31 23:59:60 + S |
| 55 | +Leap 1990 Dec 31 23:59:60 + S |
| 56 | +Leap 1992 Jun 30 23:59:60 + S |
| 57 | +Leap 1993 Jun 30 23:59:60 + S |
| 58 | +Leap 1994 Jun 30 23:59:60 + S |
| 59 | +Leap 1995 Dec 31 23:59:60 + S |
| 60 | +Leap 1997 Jun 30 23:59:60 + S |
| 61 | +Leap 1998 Dec 31 23:59:60 + S |
| 62 | +Leap 2005 Dec 31 23:59:60 + S |
| 63 | +Leap 2008 Dec 31 23:59:60 + S |
| 64 | +Leap 2012 Jun 30 23:59:60 + S |
| 65 | +Leap 2015 Jun 30 23:59:60 + S |
| 66 | +Leap 2016 Dec 31 23:59:60 + S |
| 67 | + |
| 68 | +# UTC timestamp when this leap second list expires. |
| 69 | +# Any additional leap seconds will come after this. |
| 70 | +# This Expires line is commented out for now, |
| 71 | +# so that pre-2020a zic implementations do not reject this file. |
| 72 | +#Expires 2025 Dec 28 00:00:00 |
| 73 | + |
| 74 | +# POSIX timestamps for the data in this file: |
| 75 | +#updated 1736208000 (2025-01-07 00:00:00 UTC) |
| 76 | +#expires 1766880000 (2025-12-28 00:00:00 UTC) |
| 77 | + |
| 78 | +# Updated through IERS Bulletin C (https://hpiers.obspm.fr/iers/bul/bulc/bulletinc.dat) |
| 79 | +# File expires on 28 December 2025 |
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