1 #
2 # DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
3 #
4 # This code is free software; you can redistribute it and/or modify it
5 # under the terms of the GNU General Public License version 2 only, as
6 # published by the Free Software Foundation. Oracle designates this
7 # particular file as subject to the "Classpath" exception as provided
8 # by Oracle in the LICENSE file that accompanied this code.
9 #
10 # This code is distributed in the hope that it will be useful, but WITHOUT
11 # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 # FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 # version 2 for more details (a copy is included in the LICENSE file that
14 # accompanied this code).
15 #
16 # You should have received a copy of the GNU General Public License version
17 # 2 along with this work; if not, write to the Free Software Foundation,
18 # Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 #
20 # Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 # or visit www.oracle.com if you need additional information or have any
22 # questions.
23 #
24 # Allowance for leap seconds added to each time zone file.
25
26 # This file is in the public domain.
27
28 # This file is generated automatically from the data in the public-domain
29 # NIST format leap-seconds.list file, which can be copied from
30 # <ftp://ftp.nist.gov/pub/time/leap-seconds.list>
31 # or <ftp://ftp.boulder.nist.gov/pub/time/leap-seconds.list>.
32 # For more about leap-seconds.list, please see
33 # The NTP Timescale and Leap Seconds
34 # <https://www.eecis.udel.edu/~mills/leap.html>.
35
36 # The rules for leap seconds are specified in Annex 1 (Time scales) of:
37 # Standard-frequency and time-signal emissions.
38 # International Telecommunication Union - Radiocommunication Sector
39 # (ITU-R) Recommendation TF.460-6 (02/2002)
40 # <https://www.itu.int/rec/R-REC-TF.460-6-200202-I/>.
41 # The International Earth Rotation and Reference Systems Service (IERS)
42 # periodically uses leap seconds to keep UTC to within 0.9 s of UT1
43 # (a proxy for Earth's angle in space as measured by astronomers)
44 # and publishes leap second data in a copyrighted file
45 # <https://hpiers.obspm.fr/iers/bul/bulc/Leap_Second.dat>.
46 # See: Levine J. Coordinated Universal Time and the leap second.
47 # URSI Radio Sci Bull. 2016;89(4):30-6. doi:10.23919/URSIRSB.2016.7909995
48 # <https://ieeexplore.ieee.org/document/7909995>.
49
50 # There were no leap seconds before 1972, as no official mechanism
51 # accounted for the discrepancy between atomic time (TAI) and the earth's
52 # rotation. The first ("1 Jan 1972") data line in leap-seconds.list
53 # does not denote a leap second; it denotes the start of the current definition
54 # of UTC.
55
56 # All leap-seconds are Stationary (S) at the given UTC time.
57 # The correction (+ or -) is made at the given time, so in the unlikely
58 # event of a negative leap second, a line would look like this:
59 # Leap YEAR MON DAY 23:59:59 - S
60 # Typical lines look like this:
61 # Leap YEAR MON DAY 23:59:60 + S
62 Leap 1972 Jun 30 23:59:60 + S
63 Leap 1972 Dec 31 23:59:60 + S
64 Leap 1973 Dec 31 23:59:60 + S
65 Leap 1974 Dec 31 23:59:60 + S
66 Leap 1975 Dec 31 23:59:60 + S
67 Leap 1976 Dec 31 23:59:60 + S
68 Leap 1977 Dec 31 23:59:60 + S
69 Leap 1978 Dec 31 23:59:60 + S
70 Leap 1979 Dec 31 23:59:60 + S
71 Leap 1981 Jun 30 23:59:60 + S
72 Leap 1982 Jun 30 23:59:60 + S
73 Leap 1983 Jun 30 23:59:60 + S
74 Leap 1985 Jun 30 23:59:60 + S
75 Leap 1987 Dec 31 23:59:60 + S
76 Leap 1989 Dec 31 23:59:60 + S
77 Leap 1990 Dec 31 23:59:60 + S
78 Leap 1992 Jun 30 23:59:60 + S
79 Leap 1993 Jun 30 23:59:60 + S
80 Leap 1994 Jun 30 23:59:60 + S
81 Leap 1995 Dec 31 23:59:60 + S
82 Leap 1997 Jun 30 23:59:60 + S
83 Leap 1998 Dec 31 23:59:60 + S
84 Leap 2005 Dec 31 23:59:60 + S
85 Leap 2008 Dec 31 23:59:60 + S
86 Leap 2012 Jun 30 23:59:60 + S
87 Leap 2015 Jun 30 23:59:60 + S
88 Leap 2016 Dec 31 23:59:60 + S
89
90 # UTC timestamp when this leap second list expires.
91 # Any additional leap seconds will come after this.
92 # This Expires line is commented out for now,
93 # so that pre-2020a zic implementations do not reject this file.
94 #Expires 2020 Dec 28 00:00:00
95
96 # POSIX timestamps for the data in this file:
97 #updated 1467936000 (2016-07-08 00:00:00 UTC)
98 #expires 1609113600 (2020-12-28 00:00:00 UTC)
99
100 # Updated through IERS Bulletin C59
101 # File expires on: 28 December 2020