make/data/tzdata/leapseconds
author chegar
Thu, 17 Oct 2019 20:54:25 +0100
branchdatagramsocketimpl-branch
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#
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# DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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#
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# This code is free software; you can redistribute it and/or modify it
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# under the terms of the GNU General Public License version 2 only, as
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# published by the Free Software Foundation.  Oracle designates this
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# particular file as subject to the "Classpath" exception as provided
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# by Oracle in the LICENSE file that accompanied this code.
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#
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# This code is distributed in the hope that it will be useful, but WITHOUT
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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# version 2 for more details (a copy is included in the LICENSE file that
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# accompanied this code).
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#
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# You should have received a copy of the GNU General Public License version
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# 2 along with this work; if not, write to the Free Software Foundation,
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# Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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#
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# Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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# or visit www.oracle.com if you need additional information or have any
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# questions.
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#
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# 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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# 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	1981	Jun	30	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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# 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 1593302400 (2020-06-28 00:00:00 UTC)
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#	Updated through IERS Bulletin C58
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#	File expires on:  28 June 2020