utc

CGPM passed Resolution 5 abolishing the UTC leap second for good, effective May 20, 2027, ending decades of timekeeping adjustments that risked disrupting critical infrastructure and untested negative leap second scenarios.

The International Bureau of Weights and Measures (BIPM) announced it will stop issuing leap seconds in May 2027, ending a decades-long debate after concerns that a negative leap second could disrupt technology systems worldwide.

The 28th CGPM adopted Resolution 5 (2026) laying out technical actions to ensure UTC remains continuous, effectively ending leap second adjustments to keep atomic time in sync with Earth's rotation to avoid disruption of critical infrastructure.

BIPM's 28th CGPM adopts Resolution 5 (2026) outlining technical actions to keep Coordinated Universal Time (UTC) continuous, raising the maximum |UT1−UTC| offset to avoid risky negative leap seconds, with a 30% probability of one by 2035.

The article discusses common mistakes and pitfalls when using the 'at time zone UTC' function in PostgreSQL for timezone conversions.

Gergely Orosz emphasizes the importance of using UTC timestamps or epoch time along with proper date libraries to handle time zones and daylight saving time correctly.

The IERS Bulletin C confirms that no leap second will be added at the end of December 2026, maintaining the current UTC-TAI difference of -37 seconds.