IERS Rapid Service / Prediction Center

Leap Second Announcement

NO leap second will be introduced at the end of December 2023.
The last leap second was positive and WAS introduced in UTC at the end of December 2016.

The official leap second announcement
USNO Leap Second Announcement
Differences between International Atomic Time (TAI) and Coordinated Universal Time (UTC) since 1961.


  • Learn about leap seconds