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make/data/tzdata/leapseconds

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  25 
  26 # This file is in the public domain.
  27 
  28 # This file is generated automatically from the data in the public-domain
  29 # leap-seconds.list file, which can be copied from
  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>.
  33 # For more about leap-seconds.list, please see
  34 # The NTP Timescale and Leap Seconds
  35 # <https://www.eecis.udel.edu/~mills/leap.html>.
  36 
  37 # The International Earth Rotation and Reference Systems Service
  38 # 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)
  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.
  43 # URSI Radio Sci Bull. 2016;89(4):30-6. doi:10.23919/URSIRSB.2016.7909995
  44 # <https://ieeexplore.ieee.org/document/7909995>.
  45 
  46 # There were no leap seconds before 1972, because the official mechanism
  47 # accounting for the discrepancy between atomic time and the earth's rotation
  48 # did not exist.  The first ("1 Jan 1972") data line in leap-seconds.list
  49 # does not denote a leap second; it denotes the start of the current definition
  50 # of UTC.
  51 
  52 # The correction (+ or -) is made at the given time, so lines
  53 # will typically look like:
  54 #       Leap    YEAR    MON     DAY     23:59:60        +       R/S
  55 # or
  56 #       Leap    YEAR    MON     DAY     23:59:59        -       R/S
  57 
  58 # If the leap second is Rolling (R) the given time is local time (unused here).
  59 Leap    1972    Jun     30      23:59:60        +       S
  60 Leap    1972    Dec     31      23:59:60        +       S
  61 Leap    1973    Dec     31      23:59:60        +       S
  62 Leap    1974    Dec     31      23:59:60        +       S
  63 Leap    1975    Dec     31      23:59:60        +       S
  64 Leap    1976    Dec     31      23:59:60        +       S
  65 Leap    1977    Dec     31      23:59:60        +       S
  66 Leap    1978    Dec     31      23:59:60        +       S
  67 Leap    1979    Dec     31      23:59:60        +       S
  68 Leap    1981    Jun     30      23:59:60        +       S
  69 Leap    1982    Jun     30      23:59:60        +       S
  70 Leap    1983    Jun     30      23:59:60        +       S
  71 Leap    1985    Jun     30      23:59:60        +       S
  72 Leap    1987    Dec     31      23:59:60        +       S
  73 Leap    1989    Dec     31      23:59:60        +       S
  74 Leap    1990    Dec     31      23:59:60        +       S
  75 Leap    1992    Jun     30      23:59:60        +       S
  76 Leap    1993    Jun     30      23:59:60        +       S
  77 Leap    1994    Jun     30      23:59:60        +       S
  78 Leap    1995    Dec     31      23:59:60        +       S
  79 Leap    1997    Jun     30      23:59:60        +       S
  80 Leap    1998    Dec     31      23:59:60        +       S
  81 Leap    2005    Dec     31      23:59:60        +       S
  82 Leap    2008    Dec     31      23:59:60        +       S
  83 Leap    2012    Jun     30      23:59:60        +       S
  84 Leap    2015    Jun     30      23:59:60        +       S
  85 Leap    2016    Dec     31      23:59:60        +       S
  86 
  87 # POSIX timestamps for the data in this file:
  88 #updated 1467936000
  89 #expires 1577491200
  90 
  91 #       Updated through IERS Bulletin C57
  92 #       File expires on:  28 December 2019


  25 
  26 # This file is in the public domain.
  27 
  28 # This file is generated automatically from the data in the public-domain
  29 # leap-seconds.list file, which can be copied from
  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>.
  33 # For more about leap-seconds.list, please see
  34 # The NTP Timescale and Leap Seconds
  35 # <https://www.eecis.udel.edu/~mills/leap.html>.
  36 
  37 # The International Earth Rotation and Reference Systems Service
  38 # 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)
  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.
  43 # URSI Radio Sci Bull. 2016;89(4):30-6. doi:10.23919/URSIRSB.2016.7909995
  44 # <https://ieeexplore.ieee.org/document/7909995>.

  45 # There were no leap seconds before 1972, because the official mechanism
  46 # accounting for the discrepancy between atomic time and the earth's rotation
  47 # did not exist.


  48 
  49 # The correction (+ or -) is made at the given time, so lines
  50 # will typically look like:
  51 #       Leap    YEAR    MON     DAY     23:59:60        +       R/S
  52 # or
  53 #       Leap    YEAR    MON     DAY     23:59:59        -       R/S
  54 
  55 # If the leap second is Rolling (R) the given time is local time (unused here).
  56 Leap    1972    Jun     30      23:59:60        +       S
  57 Leap    1972    Dec     31      23:59:60        +       S
  58 Leap    1973    Dec     31      23:59:60        +       S
  59 Leap    1974    Dec     31      23:59:60        +       S
  60 Leap    1975    Dec     31      23:59:60        +       S
  61 Leap    1976    Dec     31      23:59:60        +       S
  62 Leap    1977    Dec     31      23:59:60        +       S
  63 Leap    1978    Dec     31      23:59:60        +       S
  64 Leap    1979    Dec     31      23:59:60        +       S
  65 Leap    1981    Jun     30      23:59:60        +       S
  66 Leap    1982    Jun     30      23:59:60        +       S
  67 Leap    1983    Jun     30      23:59:60        +       S
  68 Leap    1985    Jun     30      23:59:60        +       S
  69 Leap    1987    Dec     31      23:59:60        +       S
  70 Leap    1989    Dec     31      23:59:60        +       S
  71 Leap    1990    Dec     31      23:59:60        +       S
  72 Leap    1992    Jun     30      23:59:60        +       S
  73 Leap    1993    Jun     30      23:59:60        +       S
  74 Leap    1994    Jun     30      23:59:60        +       S
  75 Leap    1995    Dec     31      23:59:60        +       S
  76 Leap    1997    Jun     30      23:59:60        +       S
  77 Leap    1998    Dec     31      23:59:60        +       S
  78 Leap    2005    Dec     31      23:59:60        +       S
  79 Leap    2008    Dec     31      23:59:60        +       S
  80 Leap    2012    Jun     30      23:59:60        +       S
  81 Leap    2015    Jun     30      23:59:60        +       S
  82 Leap    2016    Dec     31      23:59:60        +       S
  83 
  84 # POSIX timestamps for the data in this file:
  85 #updated 1467936000
  86 #expires 1561680000
  87 
  88 #       Updated through IERS Bulletin C56
  89 #       File expires on:  28 June 2019
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