Event page! e225d4588decf338583b76d27079f3af leap-second-time-adjustment-day

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          "first_year": 1972,
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          "observed": "on December 31st",
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          "observed": "on June 30th",
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          "observed_markdown": "on [December 31st](https://www.checkiday.com/12/31/2016)",
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