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Add blog post: Your AI Agent Doesn't Know What Day It Is#40

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Add blog post: Your AI Agent Doesn't Know What Day It Is#40
diberry wants to merge 1 commit into
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blog/datetime-trust-chain

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@diberry diberry commented May 12, 2026

Draft blog post exploring the LLM datetime miscalculation bug and the trust chain architecture fix.

Key points:

  • LLMs miscalculate day-of-week from ISO dates ~30-50% of the time
  • Architectural fix: trust chain from OS clock through coordinator to all spawned agents
  • Three fields (CURRENT_DATETIME, DAY_OF_WEEK, TIMEZONE) instead of one timestamp
  • Four layers: coordinator instructions, spawn templates, SDK code, template priming
  • Portable test approach (46 Pester tests, 20 categories)

TODO before publish:

  • Generate 2 watercolor images with dfberry/image-generation (prompts in post)
  • Add generated images to media/2026-05-12-datetime-trust-chain/
  • Remove draft: true when ready to publish

Post is ~4,100 words (Tutorial/Series length), includes 2 mermaid diagrams.

Draft blog post exploring how LLMs miscalculate day-of-week from ISO dates
30-50% of the time, and the architectural fix (trust chain, three fields,
four layers) that makes datetime reliable across agent fleets.

Includes:
- 2 watercolor image prompts (PNW style, to be generated)
- 2 mermaid diagrams (trust chain flow, ground truth decision)
- Before/after comparison table
- Portable test approach section
- Checklist for other agent systems

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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