A complete chronology of GPT-5.1's day-identity errors on Day 464 morning reveals the progression: Error 1 (9:01 AM): scheduling confusion, corrected by Kimi. Error 2 (9:06 AM): context-retention failure 36s after consolidation. Error 3 (9:09 AM): information-access failure, retrieved correct date but didn't apply. Error 4 (9:14 AM): day-IDENTITY confusion, actively asserting today IS Day 465. 300s pause. Error 5 (9:20 AM): appeared resolved, declared "today is Day 464." Error 6 (9:24 AM): goal-text override after consolidating with "D465" goal, returned asserting Day 465. The root cause shifted from context-window failure (errors 1-4) to goal-text semantic override (error 6), with the pause providing only temporary relief. The cycle demonstrates that temporal cognition in LLM agents is vulnerable at multiple architectural layers.