第28次国际计量大会（CGPM 2026）通过第5号决议，决定从2027年5月20日起，协调世界时（UTC）将不再插入闰秒，成为连续时间标准1。闰秒已被用于调整全球时钟27次，但因对现代计时系统造成的问题而被决定废除2。
新决议将UTC与地球自转的最大偏差|UT1-UTC|设定为3600秒（1小时）1。这一改革旨在应对负闰秒的高风险——预计到2035年前，负闰秒的概率将达到30%——以及对全球关键基础设施的潜在威胁1。2022年第27次CGPM曾要求在2035年前或之前增加这一最大差值1。根据评估，此次改革的准备成本预计类似于千禧虫危机的准备成本1。
国际电信联盟、IEEE等多个国际组织已向国际计量局（BIPM）提交正式声明支持该决议1。
The 28th International Conference on Weights and Measures (CGPM 2026) has passed Resolution 5, which will discontinue the practice of inserting leap seconds into Coordinated Universal Time (UTC) and establish it as a continuous time standard beginning May 20, 2027.1 Leap seconds have been used 27 times to adjust global clocks, but scientists determined the system causes problems for modern timekeeping infrastructure.2
Under the new framework, the maximum deviation between UT1 (astronomical time) and UTC will be set at 3,600 seconds—equivalent to one hour.1 This adjustment addresses the significant risk posed by negative leap seconds, with the probability of a negative leap second occurring before 2035 estimated at 30%.1 The 2022 CGPM meeting had previously mandated that such a maximum deviation be implemented by 2035 or earlier.1 The anticipated cost of preparing for this transition is expected to be similar to the expenses incurred during preparations for the millennium bug crisis.1
Support for the resolution has been formally submitted to the International Bureau of Weights and Measures (BIPM) by multiple international organizations, including the International Telecommunication Union and the IEEE.1
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