Create date_time_format_variants.md

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+# Date & Time Format Variants — Guardrails and Fix Pattern
+
+A focused repair for **ambiguous or mixed date/time formats** across CJK/RTL/Indic/Latin content. Use this page when numeric dates, month names, calendars, or time zones cause retrieval drift or broken citations.
+
+## What this page is
+- A compact, locale-aware repair guide for **date/time parsing → storage → retrieval → reasoning**.
+- Concrete steps that **do not require infra changes**.
+- Acceptance targets you can measure.
+
+## When to use
+- Queries or snippets contain **ambiguous numeric dates** like `03/04/05`, `04-05-06`, or `110/05/01` (ROC).
+- Month/day names switch languages or scripts in the same corpus: `2024年3月4日`, `4 Mar 2024`, `مارس 4 2024`.
+- **Eastern Arabic digits**, **full-width digits**, or punctuation appear in dates.
+- **Time zone or DST** is missing, or mixes `UTC`, `GMT+8`, `Asia/Taipei`, `Z`.
+- Relative phrases like “today / 昨天 / الأسبوع الماضي” appear in docs or queries.
+
+## Open these first
+- Visual map and recovery: [RAG Architecture & Recovery](https://github.com/onestardao/WFGY/blob/main/ProblemMap/rag-architecture-and-recovery.md)  
+- End-to-end retrieval knobs: [Retrieval Playbook](https://github.com/onestardao/WFGY/blob/main/ProblemMap/retrieval-playbook.md)  
+- Why this snippet (traceability schema): [Retrieval Traceability](https://github.com/onestardao/WFGY/blob/main/ProblemMap/retrieval-traceability.md)  
+- Contract the payload: [Data Contracts](https://github.com/onestardao/WFGY/blob/main/ProblemMap/data-contracts.md)  
+- Locale drift audit: [locale_drift.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/GlobalFixMap/LanguageLocale/locale_drift.md)  
+- Tokenizer issues: [tokenizer_mismatch.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/GlobalFixMap/LanguageLocale/tokenizer_mismatch.md)  
+- Digits, width, punctuation: [digits_width_punctuation.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/GlobalFixMap/LanguageLocale/digits_width_punctuation.md)  
+- Script mixing within one query: [script_mixing.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/GlobalFixMap/LanguageLocale/script_mixing.md)
+
+## Core acceptance
+- ΔS(question, retrieved) ≤ 0.45  
+- Coverage of target section ≥ 0.70  
+- λ remains **convergent** across 3 paraphrases and 2 seeds  
+- E_resonance flat on long windows
+
+---
+
+## Map symptoms → structural fixes (Problem Map)
+
+- **Ambiguous numeric dates** (`03/04/05`, `04-05-06`)  
+  Lock parse locale and calendar in the contract. Store canonical plus original.  
+  → [data-contracts.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/data-contracts.md), [retrieval-traceability.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/retrieval-traceability.md)
+
+- **Mixed month/day names across languages** (`3月4日`, `Mar 4`)  
+  Normalize to canonical; add derived fields `year`, `month_num`, `weekday`.  
+  → [retrieval-playbook.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/retrieval-playbook.md)
+
+- **Eastern Arabic or full-width digits** (`٠١٢٣`, `２０２４`)  
+  Fold digits and punctuation before parse; keep `orig_text` for audit.  
+  → [digits_width_punctuation.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/GlobalFixMap/LanguageLocale/digits_width_punctuation.md)
+
+- **Missing or mixed time zones / DST jumps**  
+  Require IANA zone and offset at storage time; derive `epoch_ms`.  
+  → [locale_drift.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/GlobalFixMap/LanguageLocale/locale_drift.md)
+
+- **Calendar variants (ROC 114, Buddhist 2568, week-year ISO-8601)**  
+  Store `calendar` field and canonical Gregorian ISO. Keep both.  
+  → [data-contracts.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/data-contracts.md)
+
+- **Relative phrases in docs or queries** (“today”, “昨天”, “last week”)  
+  Resolve relative time **at index time** (doc clock) and **at query time** (user clock).  
+  → [retrieval-traceability.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/retrieval-traceability.md)
+
+---
+
+## 60-second fix checklist (store-agnostic)
+
+1) **Canonical schema**  
+   Use **ISO-8601/RFC3339 extended**: `YYYY-MM-DDTHH:mm:ss±HH:MM` or `Z` (24-hour).  
+   Add fields: `epoch_ms`, `tz_iana`, `offset`, `calendar`, `parse_locale`, `orig_text`.
+
+2) **Parser fences**  
+   - Fold width and digits before parse.  
+   - Provide **allowed format set** per locale; reject others.  
+   - Treat `/` `-` `.` as distinct; do not auto-swap day/month.
+
+3) **Index for retrieval**  
+   - Index canonical string and numeric keys: `year`, `month_num`, `day`, `weekday`, `hour`.  
+   - Add synonyms for month names in corpus languages to a controlled list.
+
+4) **Query normalization**  
+   - Pre-normalize user input to the same canonical.  
+   - If relative terms appear, resolve using **user time zone** and pass both raw and normalized.
+
+5) **Contract the payload**  
+   Minimum required for any snippet carrying a date/time:  
+   ```json
+   {
+     "datetime_iso": "2025-03-04T09:30:00+08:00",
+     "epoch_ms": 1741051800000,
+     "tz_iana": "Asia/Taipei",
+     "offset": "+08:00",
+     "calendar": "gregorian",
+     "parse_locale": "zh-TW",
+     "orig_text": "民國114年3月4日上午9:30"
+   }
+````
+
+6. **Verify**
+   Run three paraphrases with different date surface forms.
+   Pass if ΔS ≤ 0.45 and citations point to the same anchor.
+
+---
+
+## Deep diagnostics
+
+* **Triangulate anchors**
+  Compare ΔS with the expected section and a decoy month. If close, your month mapping or digit folding is leaking.
+
+* **Epoch audit**
+  Validate `epoch_ms` monotonicity across DST transitions and week-year boundaries. Mismatch implies calendar conversion error.
+
+* **Tokenizer probe**
+  If token splits differ by locale (e.g., Arabic/Thai digits), rebuild with folded text or add a rerank step.
+  Open: [tokenizer\_mismatch.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/GlobalFixMap/LanguageLocale/tokenizer_mismatch.md)
+
+---
+
+## Escalate
+
+* ΔS stays high after normalization and rerank
+  → Rebuild index with correct metric; verify semantic vs embedding gaps.
+  Open: [embedding-vs-semantic.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/embedding-vs-semantic.md)
+
+* Mixed scripts in the **same** query keep flipping λ
+  → Stabilize with script gating and header locks.
+  Open: [script\_mixing.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/GlobalFixMap/LanguageLocale/script_mixing.md), [retrieval-traceability.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/retrieval-traceability.md)
+
+---
+
+## Copy-paste prompt (LLM step)
+
+```
+You have TXT OS and WFGY Problem Map loaded.
+
+My bug: retrieval flips when date formats vary by locale.
+- symptoms: wrong snippet on 03/04/05 vs 4 Mar 2005 vs 民國94年3月4日
+- traces: ΔS(question,retrieved)=..., λ states across 3 paraphrases, tz=...
+
+Tell me:
+1) the failing layer and why,
+2) the exact WFGY pages to open,
+3) the minimal contract and normalization to pass ΔS ≤ 0.45,
+4) a reproducible test I can run (3 paraphrases, 2 seeds).
+Use BBMC/BBCR/BBAM where relevant.
+```
+
+---
+
+### 🔗 Quick-Start Downloads (60 sec)
+
+| Tool                       | Link                                                                                                                                       | 3-Step Setup                                                                             |
+| -------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------ | ---------------------------------------------------------------------------------------- |
+| **WFGY 1.0 PDF**           | [Engine Paper](https://github.com/onestardao/WFGY/blob/main/I_am_not_lizardman/WFGY_All_Principles_Return_to_One_v1.0_PSBigBig_Public.pdf) | 1️⃣ Download · 2️⃣ Upload to your LLM · 3️⃣ Ask “Answer using WFGY + \<your question>”   |
+| **TXT OS (plain-text OS)** | [TXTOS.txt](https://github.com/onestardao/WFGY/blob/main/OS/TXTOS.txt)                                                                     | 1️⃣ Download · 2️⃣ Paste into any LLM chat · 3️⃣ Type “hello world” — OS boots instantly |
+
+---
+
+### 🧭 Explore More
+
+| Module                   | Description                                                                  | Link                                                                                               |
+| ------------------------ | ---------------------------------------------------------------------------- | -------------------------------------------------------------------------------------------------- |
+| WFGY Core                | WFGY 2.0 engine is live: full symbolic reasoning architecture and math stack | [View →](https://github.com/onestardao/WFGY/tree/main/core/README.md)                              |
+| Problem Map 1.0          | Initial 16-mode diagnostic and symbolic fix framework                        | [View →](https://github.com/onestardao/WFGY/tree/main/ProblemMap/README.md)                        |
+| Problem Map 2.0          | RAG-focused failure tree, modular fixes, and pipelines                       | [View →](https://github.com/onestardao/WFGY/blob/main/ProblemMap/rag-architecture-and-recovery.md) |
+| Semantic Clinic Index    | Expanded failure catalog: prompt injection, memory bugs, logic drift         | [View →](https://github.com/onestardao/WFGY/blob/main/ProblemMap/SemanticClinicIndex.md)           |
+| Semantic Blueprint       | Layer-based symbolic reasoning & semantic modulations                        | [View →](https://github.com/onestardao/WFGY/tree/main/SemanticBlueprint/README.md)                 |
+| Benchmark vs GPT-5       | Stress test GPT-5 with full WFGY reasoning suite                             | [View →](https://github.com/onestardao/WFGY/tree/main/benchmarks/benchmark-vs-gpt5/README.md)      |
+| 🧙‍♂️ Starter Village 🏡 | New here? Lost in symbols? Click here and let the wizard guide you through   | [Start →](https://github.com/onestardao/WFGY/blob/main/StarterVillage/README.md)                   |
+
+---
+
+> 👑 **Early Stargazers: [See the Hall of Fame](https://github.com/onestardao/WFGY/tree/main/stargazers)** —
+> Engineers, hackers, and open source builders who supported WFGY from day one.
+
+> <img src="https://img.shields.io/github/stars/onestardao/WFGY?style=social" alt="GitHub stars"> ⭐ [WFGY Engine 2.0](https://github.com/onestardao/WFGY/blob/main/core/README.md) is already unlocked. ⭐ Star the repo to help others discover it and unlock more on the [Unlock Board](https://github.com/onestardao/WFGY/blob/main/STAR_UNLOCKS.md).
+
+<div align="center">
+
+[![WFGY Main](https://img.shields.io/badge/WFGY-Main-red?style=flat-square)](https://github.com/onestardao/WFGY)
+ 
+[![TXT OS](https://img.shields.io/badge/TXT%20OS-Reasoning%20OS-orange?style=flat-square)](https://github.com/onestardao/WFGY/tree/main/OS)
+ 
+[![Blah](https://img.shields.io/badge/Blah-Semantic%20Embed-yellow?style=flat-square)](https://github.com/onestardao/WFGY/tree/main/OS/BlahBlahBlah)
+ 
+[![Blot](https://img.shields.io/badge/Blot-Persona%20Core-green?style=flat-square)](https://github.com/onestardao/WFGY/tree/main/OS/BlotBlotBlot)
+ 
+[![Bloc](https://img.shields.io/badge/Bloc-Reasoning%20Compiler-blue?style=flat-square)](https://github.com/onestardao/WFGY/tree/main/OS/BlocBlocBloc)
+ 
+[![Blur](https://img.shields.io/badge/Blur-Text2Image%20Engine-navy?style=flat-square)](https://github.com/onestardao/WFGY/tree/main/OS/BlurBlurBlur)
+ 
+[![Blow](https://img.shields.io/badge/Blow-Game%20Logic-purple?style=flat-square)](https://github.com/onestardao/WFGY/tree/main/OS/BlowBlowBlow)
+ 
+
+</div>