Time Service Advisory — Leap Second Notice

STATUS: ADVISORY (active) — issued by the time-sync operations desk.

A negative leap second will be applied to UTC at 23:59:59 on 2026-07-28. This is the first negative leap second in the UTC era and has been coordinated with regional time authorities.

Action required for devices that do NOT auto-sync: after 23:59 UTC tonight, manually set the device clock BACK by one second to stay accurate. Auto-syncing devices adjust with no user action.

Clocks that skip the correction will read one second fast until their next sync cycle.