Science

Timekeeping to Change with Leap Hour Proposal

Updated 2026-07-08 21:40 UTC 1 source Neutral

International timekeepers are set to vote on changing the leap second to a leap hour in an effort to better align Coordinated Universal Time with Earth’s rotation.

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Scientific American

International timekeepers to vote on changing the leap second to a leap hour

To align Coordinated Universal Time with Earth’s rotation, a second occasionally gets added to the year. That may change in 2027

2026-07-08 04:00 UTC