⏰CGPM Adopts UTC Continuity Resolution with 1-Hour Buffer
UTC gets a century-long buffer, leap seconds may become history
TL;DR
The CGPM adopted a resolution to ensure UTC's continuity for a century by increasing the UT1-UTC difference to 1 hour. This change aims to prevent future leap second disruptions and aligns with critical infrastructure needs.
The CGPM adopted Resolution 5, ensuring UTC's continuity for a century by increasing the maximum UT1-UTC difference to 1 hour. This move is crucial for industrial users and national infrastructures, preventing potential disruptions from leap seconds. The resolution takes effect on May 20, 2027, and aims to mitigate risks associated with negative leap seconds, which pose a 30% probability by 2035. The decision also addresses inconsistencies in timing between different systems due to varying leap second mitigation methods.
Key Points
CGPM adopted Resolution 5 in 2026 to ensure UTC's continuity for a century.
The maximum UT1-UTC difference will be increased to 3,600 seconds (1 hour) by 2027.
The probability of a negative leap second by 2035 is estimated at 30%.
Preparation for a negative leap second would require financial investment similar to the millennium bug.
The CGPM requested BIPM to collaborate with ITU, IAU, IUGG, IERS, and other organizations.
Why It Matters
If you're managing critical infrastructure or industrial systems, the change to UTC's continuity ensures long-term stability without leap second disruptions. The 1-hour buffer mitigates risks and inconsistencies, but smaller systems may face challenges adapting to the new standard.
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