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BIPM to retire the leap second by 2027

The International Bureau of Weights and Measures announced it will stop issuing leap seconds to Coordinated Universal Time starting in May 2027, ending a practice used since 1972 to reconcile atomic clock time with Earth's slowing rotation. Since 1972, 32 leap seconds have been added, with the last one inserted in 2016.

wired.com · 2026-10-16

BIPM votes to eliminate leap second starting 2026

The International Bureau of Weights and Measures voted to abolish the leap second, moving up a previously agreed 2035 deadline to May 20, 2026, timed to World Metrology Day. Instead of periodic one-second adjustments, timekeepers will allow atomic and astronomical time to diverge until a full 'leap hour' is needed, a scenario not expected for roughly 3,000 years.

theverge.com · 2026-10-16