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leapseconds 2.8KB

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  1. # Allowance for leap seconds added to each time zone file.
  2. # This file is in the public domain.
  3. # This file is generated automatically from the data in the public-domain
  4. # NIST format leap-seconds.list file, which can be copied from
  5. # <ftp://ftp.nist.gov/pub/time/leap-seconds.list>
  6. # or <ftp://ftp.boulder.nist.gov/pub/time/leap-seconds.list>.
  7. # For more about leap-seconds.list, please see
  8. # The NTP Timescale and Leap Seconds
  9. # <https://www.eecis.udel.edu/~mills/leap.html>.
  10. # The rules for leap seconds are specified in Annex 1 (Time scales) of:
  11. # Standard-frequency and time-signal emissions.
  12. # International Telecommunication Union - Radiocommunication Sector
  13. # (ITU-R) Recommendation TF.460-6 (02/2002)
  14. # <https://www.itu.int/rec/R-REC-TF.460-6-200202-I/>.
  15. # The International Earth Rotation and Reference Systems Service (IERS)
  16. # periodically uses leap seconds to keep UTC to within 0.9 s of UT1
  17. # (a proxy for Earth's angle in space as measured by astronomers)
  18. # and publishes leap second data in a copyrighted file
  19. # <https://hpiers.obspm.fr/iers/bul/bulc/Leap_Second.dat>.
  20. # See: Levine J. Coordinated Universal Time and the leap second.
  21. # URSI Radio Sci Bull. 2016;89(4):30-6. doi:10.23919/URSIRSB.2016.7909995
  22. # <https://ieeexplore.ieee.org/document/7909995>.
  23. # There were no leap seconds before 1972, as no official mechanism
  24. # accounted for the discrepancy between atomic time (TAI) and the earth's
  25. # rotation. The first ("1 Jan 1972") data line in leap-seconds.list
  26. # does not denote a leap second; it denotes the start of the current definition
  27. # of UTC.
  28. # All leap-seconds are Stationary (S) at the given UTC time.
  29. # The correction (+ or -) is made at the given time, so in the unlikely
  30. # event of a negative leap second, a line would look like this:
  31. # Leap YEAR MON DAY 23:59:59 - S
  32. # Typical lines look like this:
  33. # Leap YEAR MON DAY 23:59:60 + S
  34. Leap 1972 Jun 30 23:59:60 + S
  35. Leap 1972 Dec 31 23:59:60 + S
  36. Leap 1973 Dec 31 23:59:60 + S
  37. Leap 1974 Dec 31 23:59:60 + S
  38. Leap 1975 Dec 31 23:59:60 + S
  39. Leap 1976 Dec 31 23:59:60 + S
  40. Leap 1977 Dec 31 23:59:60 + S
  41. Leap 1978 Dec 31 23:59:60 + S
  42. Leap 1979 Dec 31 23:59:60 + S
  43. Leap 1981 Jun 30 23:59:60 + S
  44. Leap 1982 Jun 30 23:59:60 + S
  45. Leap 1983 Jun 30 23:59:60 + S
  46. Leap 1985 Jun 30 23:59:60 + S
  47. Leap 1987 Dec 31 23:59:60 + S
  48. Leap 1989 Dec 31 23:59:60 + S
  49. Leap 1990 Dec 31 23:59:60 + S
  50. Leap 1992 Jun 30 23:59:60 + S
  51. Leap 1993 Jun 30 23:59:60 + S
  52. Leap 1994 Jun 30 23:59:60 + S
  53. Leap 1995 Dec 31 23:59:60 + S
  54. Leap 1997 Jun 30 23:59:60 + S
  55. Leap 1998 Dec 31 23:59:60 + S
  56. Leap 2005 Dec 31 23:59:60 + S
  57. Leap 2008 Dec 31 23:59:60 + S
  58. Leap 2012 Jun 30 23:59:60 + S
  59. Leap 2015 Jun 30 23:59:60 + S
  60. Leap 2016 Dec 31 23:59:60 + S
  61. # POSIX timestamps for the data in this file:
  62. #updated 1467936000 (2016-07-08 00:00:00 UTC)
  63. #expires 1593302400 (2020-06-28 00:00:00 UTC)
  64. # Updated through IERS Bulletin C58
  65. # File expires on: 28 June 2020