1
  
2
  
3
  
4
  
5
  
6
  
7
  
8
  
9
  
10
  
11
  
12
  
13
  
14
  
15
  
16
  
17
  
18
  
19
  
20
  
21
  
22
  
23
  
24
  
25
  
26
  
27
  
28
  
29
  
30
  
31
  
32
  
33
  
34
  
35
  
36
  
37
  
38
  
39
  
40
  
41
  
42
  
43
  
44
  
45
  
46
  
47
  
48
  
49
  
50
  
51
  
52
  
53
  
54
  
55
  
56
  
57
  
58
  
59
  
60
  
61
  
62
  
63
  
64
  
65
  
66
  
67
  
68
  
69
  
70
  
# 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 
# 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> 
# or <ftp://tycho.usno.navy.mil/pub/ntp/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) 
# 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.  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 
#       Leap    YEAR    MON     DAY     23:59:59        -       R/S 
 
# If the leap second is Rolling (R) the given time is local time (unused here). 
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 
 
# POSIX timestamps for the data in this file: 
#updated 1467936000 
#expires 1577491200 
 
#       Updated through IERS Bulletin C57 
#       File expires on:  28 December 2019