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make/data/tzdata/leapseconds
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rev 13618 : 8224560: (tz) Upgrade time-zone data to tzdata2019a
8215982: (tz) Upgrade time-zone data to tzdata2018i
8225580: tzdata2018i integration causes test failures on jdk-13
Reviewed-by: andrew, naoto
@@ -40,13 +40,16 @@
# 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, because the official mechanism
# accounting for the discrepancy between atomic time and the earth's rotation
-# did not exist.
+# did not exist. 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.
# The correction (+ or -) is made at the given time, so lines
# will typically look like:
# Leap YEAR MON DAY 23:59:60 + R/S
# or
@@ -81,9 +84,9 @@
Leap 2015 Jun 30 23:59:60 + S
Leap 2016 Dec 31 23:59:60 + S
# POSIX timestamps for the data in this file:
#updated 1467936000
-#expires 1561680000
+#expires 1577491200
-# Updated through IERS Bulletin C56
-# File expires on: 28 June 2019
+# Updated through IERS Bulletin C57
+# File expires on: 28 December 2019
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