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classifyLocal: Report whether a zoneless local wall time is unique, ambiguous or nonexistent in a zone — before any policy resolves it.
fromOffsetInstant: Render an instant-plus-offset pair back to the local time it describes.
resolveLocal: Resolve a zoneless local wall time in a time zone and return the instant it names.
toOffsetInstant: Split an ISO 8601 instant string into the instant-plus-offset pair the world exchanges.
isValidUtcOffset: Return true when value is a UTC offset in the form the offset-instant pair stores: ISO 8601 extended ±HH:MM, optionally ±HH:MM:SS.