According to the IERS, today, for the first time since the establishment of the modern definition of UTC in 1973, the quantity UT1-UTC crosses zero while increasing. If this continues we will have a negative leap second, probably some time in the 2030s.
https://datacenter.iers.org/data/html/bulletina-xxxvi-034.html If you project the modern definition of UTC back in time, the last time this would have happened was in 1894. John Sauter ([email protected]) -- get my PGP public key with gpg --locate-external-keys [email protected]
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