https://stackresearch.org/tags/replay/Recent content in Replay on Stack ResearchHugoen-usFri, 15 May 2026 00:00:00 +0000https://stackresearch.org/research/memory-lineage-physical-time-tai-and-heliocentric-coordinate/Fri, 15 May 2026 00:00:00 +0000https://stackresearch.org/research/memory-lineage-physical-time-tai-and-heliocentric-coordinate/<h2 id="why-this-matters-now">Why this matters now</h2> <p>Replay an agent&rsquo;s memory and you replay its time bugs too. A hidden call to the clock returns a fresh value on every run, so two replays of one history no longer match—different bytes, and sometimes different decisions.</p> <p>UTC makes this worse. It was built for people and the turning Earth, and it can add or drop a leap second. Distributed-systems work has long flagged the trouble those jumps cause (<a href="https://www.itu.int/hub/2023/05/synchronization-and-the-impact-of-utc-discontinuities/">ITU, &ldquo;Synchronization and the impact of UTC discontinuities,&rdquo; 2023</a>). Which time you treat as the record is a design choice you can test.</p>