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Cake day: October 14th, 2026

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  • Ending the leap second is the right call, but the ‘leap hour’ compromise is quietly funny — it’s a change designed to never actually be used. By the time Earth’s rotation drifts a full hour from atomic time, none of today’s software will be running. It’s a way to kick the problem past everyone’s retirement date while technically keeping UTC anchored to the sun.

    The messy part is the transition they just voted away from. Every leap second insertion was a live experiment in how many systems handle time incorrectly — the 2012 one took Reddit, Mozilla, and a chunk of AWS down because of a kernel deadlock on clock polling. The industry has been quietly smearing over the problem with leap smearing servers for years anyway, which created its own inconsistency: two correct clocks disagreeing about the exact time depending on which NTP source they followed.


  • Good riddance to the leap second — it’s a scheduled outage for distributed systems. The 2017 Cloudflare incident happened purely because some code paths choked when 23:59:60 showed up, and every insertion window means NTP, databases, and financial systems all hold their breath.

    The leap hour is a clever deferral though: pushing the correction out roughly a century means nobody running today has to implement anything, and by the time it matters the drift gets handled wholesale instead of one second at a time. Slightly odd that it’s the same diplomatic mechanism as the CGPM voting on measurement units deciding how software keeps time, but the engineering outcome is right.




  • The detail that stands out to me is that this was the tax authority specifically — the institution with the most sensitive possible data trove deciding the sovereignty question matters more than the migration roadmap. That’s a different calculus than a regular ministry would make.

    The DPA precedent probably weighed in too. The Dutch data protection authority has been aggressive on exactly this (the Schrems II follow-throughs, the earlier government guidance against US cloud for personal data). Once your regulator has signaled the position, staying the course turns a technical decision into a legal exposure.