Philippe Richard

Director of Switzerland's Federal Institute of Metrology (METAS)

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Last updated Oct 27, 2026

Stories

International timekeepers vote to abolish the leap second

Rule Changes

Explained the leap hour and its timescale in an Oct. 24, 2026 NPR interview

Coordinated Universal Time stops adding leap seconds on May 20, 2027. Delegates from 69 countries approved the change at a meeting in Versailles on Oct. 15, ending a practice that began in 1972.

Updated Oct 27