| # |
| # DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| # |
| # This code is free software; you can redistribute it and/or modify it |
| # under the terms of the GNU General Public License version 2 only, as |
| # published by the Free Software Foundation. Oracle designates this |
| # particular file as subject to the "Classpath" exception as provided |
| # by Oracle in the LICENSE file that accompanied this code. |
| # |
| # This code is distributed in the hope that it will be useful, but WITHOUT |
| # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| # FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| # version 2 for more details (a copy is included in the LICENSE file that |
| # accompanied this code). |
| # |
| # You should have received a copy of the GNU General Public License version |
| # 2 along with this work; if not, write to the Free Software Foundation, |
| # Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| # |
| # Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| # or visit www.oracle.com if you need additional information or have any |
| # questions. |
| # |
| # 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 |
