chore, update leapseconds

Author: hroptatyr

lib/leapseconds

@@ -1,15 +1,20 @@
-# <pre>
-# @(#)leapseconds	8.13
-# This file is in the public domain, so clarified as of
-# 2009-05-17 by Arthur David Olson.
+# Allowance for leap seconds added to each time zone file.
 
-# Allowance for leapseconds added to each timezone file.
+# This file is in the public domain.
 
-# The International Earth Rotation Service periodically uses leap seconds
-# to keep UTC to within 0.9 s of UT1
+# This file is generated automatically from the data in the public-domain
+# leap-seconds.list file, which is copied from:
+# ftp://ftp.nist.gov/pub/time/leap-seconds.list
+# For more about leap-seconds.list, please see
+# The NTP Timescale and Leap Seconds
+# https://www.eecis.udel.edu/~mills/leap.html
+
+# The International Earth Rotation and Reference Systems Service
+# periodically uses leap seconds to keep UTC to within 0.9 s of UT1
 # (which measures the true angular orientation of the earth in space); see
-# Terry J Quinn, The BIPM and the accurate measure of time,
-# Proc IEEE 79, 7 (July 1991), 894-905.
+# Levine J. Coordinated Universal Time and the leap second.
+# URSI Radio Sci Bull. 2016;89(4):30-6. doi:10.23919/URSIRSB.2016.7909995
+# http://ieeexplore.ieee.org/document/7909995/
 # There were no leap seconds before 1972, because the official mechanism
 # accounting for the discrepancy between atomic time and the earth's rotation
 # did not exist until the early 1970s.
@@ -20,8 +25,8 @@
 # or
 #	Leap	YEAR	MON	DAY	23:59:59	-	R/S
 
-# If the leapsecond is Rolling (R) the given time is local time
-# If the leapsecond is Stationary (S) the given time is UTC
+# If the leapsecond is Rolling (R) the given time is local time.
+# If the leapsecond is Stationary (S) the given time is UTC.
 
 # Leap	YEAR	MONTH	DAY	HH:MM:SS	CORR	R/S
 Leap	1972	Jun	30	23:59:60	+	S
@@ -49,53 +54,8 @@ 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
 
-# INTERNATIONAL EARTH ROTATION AND REFERENCE SYSTEMS SERVICE (IERS)
-#
-# SERVICE INTERNATIONAL DE LA ROTATION TERRESTRE ET DES SYSTEMES DE REFERENCE
-#
-#
-# SERVICE DE LA ROTATION TERRESTRE
-# OBSERVATOIRE DE PARIS
-# 61, Av. de l'Observatoire 75014 PARIS (France)
-# Tel.      : 33 (0) 1 40 51 22 26
-# FAX       : 33 (0) 1 40 51 22 91
-# e-mail    : (E-Mail Removed)
-# http://hpiers.obspm.fr/eop-pc
-#
-# Paris, 5 January 2012
-#
-#
-# Bulletin C 43
-#
-# To authorities responsible
-# for the measurement and
-# distribution of time
-#
-#
-# UTC TIME STEP
-# on the 1st of July 2012
-#
-#
-# A positive leap second will be introduced at the end of June 2012.
-# The sequence of dates of the UTC second markers will be:		
-# 		
-#                          2012 June 30,     23h 59m 59s
-#                          2012 June 30,     23h 59m 60s
-#                          2012 July  1,      0h  0m  0s
-#
-# The difference between UTC and the International Atomic Time TAI is:
-#
-# from 2009 January 1, 0h UTC, to 2012 July 1  0h UTC  : UTC-TAI = - 34s
-# from 2012 July 1,    0h UTC, until further notice    : UTC-TAI = - 35s
-#
-# Leap seconds can be introduced in UTC at the end of the months of December
-# or June, depending on the evolution of UT1-TAI. Bulletin C is mailed every
-# six months, either to announce a time step in UTC or to confirm that there
-# will be no time step at the next possible date.
-#
-#
-# Daniel GAMBIS
-# Head		
-# Earth Orientation Center of IERS
-# Observatoire de Paris, France
+#	Updated through IERS Bulletin C55
+#	File expires on:  28 December 2018