leapseconds 3.1 KB

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  1. # <pre>
  2. # This file is in the public domain, so clarified as of
  3. # 2009-05-17 by Arthur David Olson.
  4. # Allowance for leapseconds added to each timezone file.
  5. # The International Earth Rotation Service periodically uses leap seconds
  6. # to keep UTC to within 0.9 s of UT1
  7. # (which measures the true angular orientation of the earth in space); see
  8. # Terry J Quinn, The BIPM and the accurate measure of time,
  9. # Proc IEEE 79, 7 (July 1991), 894-905.
  10. # There were no leap seconds before 1972, because the official mechanism
  11. # accounting for the discrepancy between atomic time and the earth's rotation
  12. # did not exist until the early 1970s.
  13. # The correction (+ or -) is made at the given time, so lines
  14. # will typically look like:
  15. # Leap YEAR MON DAY 23:59:60 + R/S
  16. # or
  17. # Leap YEAR MON DAY 23:59:59 - R/S
  18. # If the leapsecond is Rolling (R) the given time is local time
  19. # If the leapsecond is Stationary (S) the given time is UTC
  20. # Leap YEAR MONTH DAY HH:MM:SS CORR R/S
  21. Leap 1972 Jun 30 23:59:60 + S
  22. Leap 1972 Dec 31 23:59:60 + S
  23. Leap 1973 Dec 31 23:59:60 + S
  24. Leap 1974 Dec 31 23:59:60 + S
  25. Leap 1975 Dec 31 23:59:60 + S
  26. Leap 1976 Dec 31 23:59:60 + S
  27. Leap 1977 Dec 31 23:59:60 + S
  28. Leap 1978 Dec 31 23:59:60 + S
  29. Leap 1979 Dec 31 23:59:60 + S
  30. Leap 1981 Jun 30 23:59:60 + S
  31. Leap 1982 Jun 30 23:59:60 + S
  32. Leap 1983 Jun 30 23:59:60 + S
  33. Leap 1985 Jun 30 23:59:60 + S
  34. Leap 1987 Dec 31 23:59:60 + S
  35. Leap 1989 Dec 31 23:59:60 + S
  36. Leap 1990 Dec 31 23:59:60 + S
  37. Leap 1992 Jun 30 23:59:60 + S
  38. Leap 1993 Jun 30 23:59:60 + S
  39. Leap 1994 Jun 30 23:59:60 + S
  40. Leap 1995 Dec 31 23:59:60 + S
  41. Leap 1997 Jun 30 23:59:60 + S
  42. Leap 1998 Dec 31 23:59:60 + S
  43. Leap 2005 Dec 31 23:59:60 + S
  44. Leap 2008 Dec 31 23:59:60 + S
  45. Leap 2012 Jun 30 23:59:60 + S
  46. # INTERNATIONAL EARTH ROTATION AND REFERENCE SYSTEMS SERVICE (IERS)
  47. #
  48. # SERVICE INTERNATIONAL DE LA ROTATION TERRESTRE ET DES SYSTEMES DE REFERENCE
  49. #
  50. #
  51. # SERVICE DE LA ROTATION TERRESTRE
  52. # OBSERVATOIRE DE PARIS
  53. # 61, Av. de l'Observatoire 75014 PARIS (France)
  54. # Tel. : 33 (0) 1 40 51 22 26
  55. # FAX : 33 (0) 1 40 51 22 91
  56. # e-mail : (E-Mail Removed)
  57. # http://hpiers.obspm.fr/eop-pc
  58. #
  59. # Paris, 5 January 2012
  60. #
  61. #
  62. # Bulletin C 43
  63. #
  64. # To authorities responsible
  65. # for the measurement and
  66. # distribution of time
  67. #
  68. #
  69. # UTC TIME STEP
  70. # on the 1st of July 2012
  71. #
  72. #
  73. # A positive leap second will be introduced at the end of June 2012.
  74. # The sequence of dates of the UTC second markers will be:
  75. #
  76. # 2012 June 30, 23h 59m 59s
  77. # 2012 June 30, 23h 59m 60s
  78. # 2012 July 1, 0h 0m 0s
  79. #
  80. # The difference between UTC and the International Atomic Time TAI is:
  81. #
  82. # from 2009 January 1, 0h UTC, to 2012 July 1 0h UTC : UTC-TAI = - 34s
  83. # from 2012 July 1, 0h UTC, until further notice : UTC-TAI = - 35s
  84. #
  85. # Leap seconds can be introduced in UTC at the end of the months of December
  86. # or June, depending on the evolution of UT1-TAI. Bulletin C is mailed every
  87. # six months, either to announce a time step in UTC or to confirm that there
  88. # will be no time step at the next possible date.
  89. #
  90. #
  91. # Daniel GAMBIS
  92. # Head
  93. # Earth Orientation Center of IERS
  94. # Observatoire de Paris, France