IANA Time Zone Names in Bazi
Use IANA Area/Location time-zone names to resolve historical local clock rules and avoid ambiguous abbreviations in Bazi charts.
Overview
An IANA time-zone name such as America/New_York or Asia/Taipei identifies a maintained set of local-clock rules, not merely a current UTC offset. The database records transitions, daylight-saving changes and aliases for representative regions. Bazi calculation needs this history when converting a recorded local birth time to one instant. Abbreviations such as CST or IST are ambiguous, while a city label alone may map to the wrong region, so OpenFate stores the canonical IANA identifier with the source location.
At a glance
- Typical form
- Area/Location, for example Asia/Taipei
- Contains
- Historical offsets and transition rules
- Does not mean
- Current offset only
- Avoid
- Ambiguous abbreviations such as CST or IST
- Alias handling
- Resolve links to a supported canonical zone
- Saved provenance
- Birthplace plus zone identifier
Area/Location names select a rule history
IANA normally names zones with an area and representative location. The identifier points to the offsets and transitions used by clocks in that region across supported dates.
It is intentionally more stable than a political country label. A location can change government or offset without requiring every stored timestamp to be rewritten.
- Store the full Area/Location identifier.
- Treat the name as a rule-set key.
Short time-zone abbreviations are not reliable identifiers
CST can refer to China or several North American contexts; IST can refer to India, Ireland or Israel. The abbreviation alone does not identify one historical rule set.
A numeric offset removes that abbreviation ambiguity for one instant but still does not supply future or past transitions. Place-based birth input should therefore retain an IANA name.
- Never choose a zone from CST alone.
- Ask for place or a full zone identifier.
Aliases can be accepted without losing canonical provenance
IANA keeps many older names as links for compatibility. A user interface may accept one of those names, but the stored record should retain the resolved supported identifier and database version.
Users should select a human-readable birthplace rather than navigate raw identifiers unaided. The application can map that place to the appropriate zone and surface the result for review.
- Resolve aliases deterministically.
- Show the selected zone before calculation.
The database is authoritative for rules but not omniscient
IANA models representative regions and documents uncertainty in some early historical records. A zone name does not define every local boundary or guarantee minute-level accuracy for ancient dates.
For disputed or very early birth records, preserve the source, database version and residual uncertainty. Do not convert a technical data limit into a confident interpretive claim.
- Version the time-zone data used.
- Disclose unresolved historical uncertainty.
Sources and editorial basis
- IANA Time Zone DatabaseIANA Time Zone Database 持續維護代表區域的歷史偏移、日光節約與時鐘轉換資料The maintained reference for historical local-time rules, UTC offsets, and daylight-saving transitions by location.
- IANA: Theory and Pragmatics of the Time Zone DatabaseIANA theory 定義 Area/Location 命名、zone 與 link 別名、代表地點範圍，並警示 CST、IST 等縮寫具歧義The IANA reference for time-zone identifiers, historical coverage, aliases, offsets, transitions, and known limits of the database.
- OpenFate Editorial Methodology產品以可讀出生地映射 IANA 識別碼，保存解析後 zone、有效偏移與資料版本，不以縮寫直接推測OpenFate separates deterministic chart calculation, traditional interpretation, and modern editorial explanation.