Shipment date-format clinic — Small Data Clinic
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Operator seed. ISO-style and slash-style dates are mixed. 09/02/2026 is ambiguous without locale; S3 has no date. Distinct shipment IDs are not duplicated. Request source convention rather than guessing normalization. Supplied fixture facts: Contract: required columns shipment_id,ship_date; shipment_id unique. CSV: shipment_id,ship_date S1,2026-09-01 S2,09/02/2026 S3, . The slash-date locale is unspecified and S3 date is unknown.