Today an international group of scientists, diplomats, and timekeepers voted to end the leap second, which has been keeping Coordinated Universal Time (UTC) aligned with the time according to Earth’s rotation (UT1) within one second of difference.
A new system, called the “leap hour,” will allow the Earth’s rotation and official time to fall out of alignment by a full hour
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.