24 # Allowance for leap seconds added to each time zone file. |
24 # Allowance for leap seconds added to each time zone file. |
25 |
25 |
26 # This file is in the public domain. |
26 # This file is in the public domain. |
27 |
27 |
28 # This file is generated automatically from the data in the public-domain |
28 # This file is generated automatically from the data in the public-domain |
29 # leap-seconds.list file, which is copied from: |
29 # leap-seconds.list file, which can be copied from |
30 # ftp://ftp.nist.gov/pub/time/leap-seconds.list |
30 # <ftp://ftp.nist.gov/pub/time/leap-seconds.list> |
|
31 # or <ftp://ftp.boulder.nist.gov/pub/time/leap-seconds.list> |
|
32 # or <ftp://tycho.usno.navy.mil/pub/ntp/leap-seconds.list>. |
31 # For more about leap-seconds.list, please see |
33 # For more about leap-seconds.list, please see |
32 # The NTP Timescale and Leap Seconds |
34 # The NTP Timescale and Leap Seconds |
33 # https://www.eecis.udel.edu/~mills/leap.html |
35 # <https://www.eecis.udel.edu/~mills/leap.html>. |
34 |
36 |
35 # The International Earth Rotation and Reference Systems Service |
37 # The International Earth Rotation and Reference Systems Service |
36 # periodically uses leap seconds to keep UTC to within 0.9 s of UT1 |
38 # periodically uses leap seconds to keep UTC to within 0.9 s of UT1 |
37 # (which measures the true angular orientation of the earth in space); see |
39 # (which measures the true angular orientation of the earth in space) |
38 # Levine J. Coordinated Universal Time and the leap second. |
40 # and publishes leap second data in a copyrighted file |
|
41 # <https://hpiers.obspm.fr/iers/bul/bulc/Leap_Second.dat>. |
|
42 # See: Levine J. Coordinated Universal Time and the leap second. |
39 # URSI Radio Sci Bull. 2016;89(4):30-6. doi:10.23919/URSIRSB.2016.7909995 |
43 # URSI Radio Sci Bull. 2016;89(4):30-6. doi:10.23919/URSIRSB.2016.7909995 |
40 # http://ieeexplore.ieee.org/document/7909995/ |
44 # <https://ieeexplore.ieee.org/document/7909995>. |
41 # There were no leap seconds before 1972, because the official mechanism |
45 # There were no leap seconds before 1972, because the official mechanism |
42 # accounting for the discrepancy between atomic time and the earth's rotation |
46 # accounting for the discrepancy between atomic time and the earth's rotation |
43 # did not exist until the early 1970s. |
47 # did not exist. |
44 |
48 |
45 # The correction (+ or -) is made at the given time, so lines |
49 # The correction (+ or -) is made at the given time, so lines |
46 # will typically look like: |
50 # will typically look like: |
47 # Leap YEAR MON DAY 23:59:60 + R/S |
51 # Leap YEAR MON DAY 23:59:60 + R/S |
48 # or |
52 # or |
49 # Leap YEAR MON DAY 23:59:59 - R/S |
53 # Leap YEAR MON DAY 23:59:59 - R/S |
50 |
54 |
51 # If the leapsecond is Rolling (R) the given time is local time. |
55 # If the leap second is Rolling (R) the given time is local time (unused here). |
52 # If the leapsecond is Stationary (S) the given time is UTC. |
|
53 |
|
54 # Leap YEAR MONTH DAY HH:MM:SS CORR R/S |
|
55 Leap 1972 Jun 30 23:59:60 + S |
56 Leap 1972 Jun 30 23:59:60 + S |
56 Leap 1972 Dec 31 23:59:60 + S |
57 Leap 1972 Dec 31 23:59:60 + S |
57 Leap 1973 Dec 31 23:59:60 + S |
58 Leap 1973 Dec 31 23:59:60 + S |
58 Leap 1974 Dec 31 23:59:60 + S |
59 Leap 1974 Dec 31 23:59:60 + S |
59 Leap 1975 Dec 31 23:59:60 + S |
60 Leap 1975 Dec 31 23:59:60 + S |