The question of whether systems are ready for the first negative leap second is a subject of significant concern and active discussion in the technical community. As of July 2026, a negative leap second has never occurred, and there is widespread uncertainty regarding how software and infrastructure will handle it. Key points regarding the current situation include: * **Unprecedented Event:** All previous leap seconds have been "positive" (adding a second). A negative leap second would require clocks to skip a second (e.g., jumping from 11:59:58 directly to midnight), which many systems are not programmed to handle. * **Systemic Risk:** Experts and technical discussions (such as those on Hacker News) highlight that many software systems, databases, and critical infrastructure components have never been tested for a negative leap second. There is a fear that this could cause unpredictable behavior or system failures. * **Regulatory Response:** Due to these risks, international timekeeping authorities are actively working to address the issue. There is an upcoming vote scheduled for October 2026 by the General Conference on Weights and Measures (CGPM) to potentially replace the traditional leap second with a "leap hour" or other alternatives to avoid the need for a negative leap second entirely. * **Timeline:** While the need for a negative leap second is being driven by Earth's recent record-breaking rotation speeds, the proposed changes to the timekeeping system are aimed at averting this event, with potential implementation of new standards as early as 2027 or 2029. In summary, systems are generally **not considered ready** for a negative leap second, which is precisely why international bodies are currently attempting to change the rules to avoid having to implement one.