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Leap seconds are only announced six months in advance. We don't know how long the 2020s are going to be
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Specifically, leap seconds (or lack thereof) are announced in IERS Bulletin C, which is charmingly addressed "To authorities responsible for the measurement and distribution of time"pic.twitter.com/Qn7FoJbLSX
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And we don't even have that as a hard deadline. In practice they issue Bulletin C up to several days or weeks after the half year point. Heck in late 2012 they were over a month late. At least they publish negative acknowledgments. (Source: https://www.iers.org/IERS/EN/Publications/Bulletins/bulletins.html …)
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