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 available from most NIST time servers. |
29 # leap-seconds.list file, which is copied from: |
30 # If the URL <ftp://time.nist.gov/pub/leap-seconds.list> does not work, |
30 # ftp://ftp.nist.gov/pub/time/leap-seconds.list |
31 # you should be able to pick up leap-seconds.list from a secondary NIST server. |
|
32 # See <http://tf.nist.gov/tf-cgi/servers.cgi> for a list of secondary servers. |
|
33 # For more about leap-seconds.list, please see |
31 # For more about leap-seconds.list, please see |
34 # The NTP Timescale and Leap Seconds |
32 # The NTP Timescale and Leap Seconds |
35 # http://www.eecis.udel.edu/~mills/leap.html |
33 # https://www.eecis.udel.edu/~mills/leap.html |
36 |
34 |
37 # The International Earth Rotation and Reference Systems Service |
35 # The International Earth Rotation and Reference Systems Service |
38 # periodically uses leap seconds to keep UTC to within 0.9 s of UT1 |
36 # periodically uses leap seconds to keep UTC to within 0.9 s of UT1 |
39 # (which measures the true angular orientation of the earth in space); see |
37 # (which measures the true angular orientation of the earth in space); see |
40 # Terry J Quinn, The BIPM and the accurate measure of time, |
38 # Levine J. Coordinated Universal Time and the leap second. |
41 # Proc IEEE 79, 7 (July 1991), 894-905 <http://dx.doi.org/10.1109/5.84965>. |
39 # URSI Radio Sci Bull. 2016;89(4):30-6. doi:10.23919/URSIRSB.2016.7909995 |
|
40 # http://ieeexplore.ieee.org/document/7909995/ |
42 # There were no leap seconds before 1972, because the official mechanism |
41 # There were no leap seconds before 1972, because the official mechanism |
43 # accounting for the discrepancy between atomic time and the earth's rotation |
42 # accounting for the discrepancy between atomic time and the earth's rotation |
44 # did not exist until the early 1970s. |
43 # did not exist until the early 1970s. |
45 |
44 |
46 # The correction (+ or -) is made at the given time, so lines |
45 # The correction (+ or -) is made at the given time, so lines |
79 Leap 2008 Dec 31 23:59:60 + S |
78 Leap 2008 Dec 31 23:59:60 + S |
80 Leap 2012 Jun 30 23:59:60 + S |
79 Leap 2012 Jun 30 23:59:60 + S |
81 Leap 2015 Jun 30 23:59:60 + S |
80 Leap 2015 Jun 30 23:59:60 + S |
82 Leap 2016 Dec 31 23:59:60 + S |
81 Leap 2016 Dec 31 23:59:60 + S |
83 |
82 |
84 # Updated through IERS Bulletin C53 |
83 # Updated through IERS Bulletin C54 |
85 # File expires on: 28 December 2017 |
84 # File expires on: 28 June 2018 |