DescriptionThis paper examines the inherent temporal limitations of certification as a mechanism for safety assurance. Certification regimes such as CE, UL, BS, and similar standards-based systems are designed to confirm conformity with defined requirements at a specific point in time. They provide robust evidence that a product, system, or building met prescribed criteria when assessed.However, certification is frequently relied upon as evidence of present safety, despite being structurally retrospective. Once issued, a certificate immediately becomes historical evidence and does not account for subsequent changes in environment, configuration, maintenance, usage, or degradation.This paper does not challenge the legitimacy, competence, or necessity of certification. Instead, it clarifies the governance distinction between historical conformity and contemporaneous safety. It demonstrates why certification can prove that requirements were met in the past, but cannot, on its own, prove that safety conditions remain intact at the moment safety is relied upon.By framing certification as a time-bound assurance instrument rather than a continuous proof mechanism, the paper highlights a critical governance gap between static assurance and dynamic operational reality. The analysis is non-prescriptive and non-adversarial, intended to support clearer regulatory reasoning, risk assessment, and accountability at the moment of reliance.