{
  "name": "TAI−UTC before 1972",
  "desc": "The formulas that set TAI−UTC from 1961 to 1971, one segment per row, with the value at the start of each segment and just before its end, and the 1972 switch to a whole-second offset of 10 s.",
  "lic": "CC BY 4.0",
  "lic_url": "https://creativecommons.org/licenses/by/4.0/",
  "by": "The Yardstick Almanac",
  "url": "https://theyardstickalmanac.com/calendars/leap-second/",
  "from": [
    "IERS Earth Orientation Center: UTC-TAI.history and TimeSteps.history (factual values, read 2026-11-01)"
  ],
  "how": "Compiled by The Yardstick Almanac from the data listed",
  "data_by": [
    "IERS UTC-TAI.history and TimeSteps.history (factual values), read 2026-11-01; computed 2026-11-01, CC BY 4.0"
  ]
}