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leapseconds

leapseconds 2.5 KB
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  1. # Allowance for leap seconds added to each time zone file.
    2. 

  2. 

  3. # This file is in the public domain.
    4. 

  4. 

  5. # This file is generated automatically from the data in the public-domain
    6. 

  6. # leap-seconds.list file, which can be copied from
    7. 

  7. # <ftp://ftp.nist.gov/pub/time/leap-seconds.list>
    8. 

  8. # or <ftp://ftp.boulder.nist.gov/pub/time/leap-seconds.list>
    9. 

  9. # or <ftp://tycho.usno.navy.mil/pub/ntp/leap-seconds.list>.
    10. 

  10. # For more about leap-seconds.list, please see
    11. 

  11. # The NTP Timescale and Leap Seconds
    12. 

  12. # <https://www.eecis.udel.edu/~mills/leap.html>.
    13. 

  13. 

  14. # The International Earth Rotation and Reference Systems Service
    15. 

  15. # periodically uses leap seconds to keep UTC to within 0.9 s of UT1
    16. 

  16. # (which measures the true angular orientation of the earth in space)
    17. 

  17. # and publishes leap second data in a copyrighted file
    18. 

  18. # <https://hpiers.obspm.fr/iers/bul/bulc/Leap_Second.dat>.
    19. 

  19. # See: Levine J. Coordinated Universal Time and the leap second.
    20. 

  20. # URSI Radio Sci Bull. 2016;89(4):30-6. doi:10.23919/URSIRSB.2016.7909995
    21. 

  21. # <https://ieeexplore.ieee.org/document/7909995>.
    22. 

  22. 

  23. # There were no leap seconds before 1972, because the official mechanism
    24. 

  24. # accounting for the discrepancy between atomic time and the earth's rotation
    25. 

  25. # did not exist.  The first ("1 Jan 1972") data line in leap-seconds.list
    26. 

  26. # does not denote a leap second; it denotes the start of the current definition
    27. 

  27. # of UTC.
    28. 

  28. 

  29. # The correction (+ or -) is made at the given time, so lines
    30. 

  30. # will typically look like:
    31. 

  31. #	Leap	YEAR	MON	DAY	23:59:60	+	R/S
    32. 

  32. # or
    33. 

  33. #	Leap	YEAR	MON	DAY	23:59:59	-	R/S
    34. 

  34. 

  35. # If the leap second is Rolling (R) the given time is local time (unused here).
    36. 

  36. Leap	1972	Jun	30	23:59:60	+	S
    37. 

  37. Leap	1972	Dec	31	23:59:60	+	S
    38. 

  38. Leap	1973	Dec	31	23:59:60	+	S
    39. 

  39. Leap	1974	Dec	31	23:59:60	+	S
    40. 

  40. Leap	1975	Dec	31	23:59:60	+	S
    41. 

  41. Leap	1976	Dec	31	23:59:60	+	S
    42. 

  42. Leap	1977	Dec	31	23:59:60	+	S
    43. 

  43. Leap	1978	Dec	31	23:59:60	+	S
    44. 

  44. Leap	1979	Dec	31	23:59:60	+	S
    45. 

  45. Leap	1981	Jun	30	23:59:60	+	S
    46. 

  46. Leap	1982	Jun	30	23:59:60	+	S
    47. 

  47. Leap	1983	Jun	30	23:59:60	+	S
    48. 

  48. Leap	1985	Jun	30	23:59:60	+	S
    49. 

  49. Leap	1987	Dec	31	23:59:60	+	S
    50. 

  50. Leap	1989	Dec	31	23:59:60	+	S
    51. 

  51. Leap	1990	Dec	31	23:59:60	+	S
    52. 

  52. Leap	1992	Jun	30	23:59:60	+	S
    53. 

  53. Leap	1993	Jun	30	23:59:60	+	S
    54. 

  54. Leap	1994	Jun	30	23:59:60	+	S
    55. 

  55. Leap	1995	Dec	31	23:59:60	+	S
    56. 

  56. Leap	1997	Jun	30	23:59:60	+	S
    57. 

  57. Leap	1998	Dec	31	23:59:60	+	S
    58. 

  58. Leap	2005	Dec	31	23:59:60	+	S
    59. 

  59. Leap	2008	Dec	31	23:59:60	+	S
    60. 

  60. Leap	2012	Jun	30	23:59:60	+	S
    61. 

  61. Leap	2015	Jun	30	23:59:60	+	S
    62. 

  62. Leap	2016	Dec	31	23:59:60	+	S
    63. 

  63. 

  64. # POSIX timestamps for the data in this file:
    65. 

  65. #updated 1467936000
    66. 

  66. #expires 1577491200
    67. 

  67. 

  68. #	Updated through IERS Bulletin C57
    69. 

  69. #	File expires on:  28 December 2019
    70. 

  70.