Decision
Present timestamps without shifting calendar dates or exposing raw storage formatting.
Groundwork Rule
Show readable local time
Complete user-readable behavior generated from the authoritative rule module.
Rule decision
Behavior
Required behavior
Store timestamps as ISO 8601; Display them in a saved valid IANA time zone or the viewing device local time; Keep calendar-only dates stable
Prohibited behavior
Infer time zone from a postal address; Show raw UTC merely for storage convenience
Boundary or exception
Use a readable device-local fallback.
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