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For the 4-digit codes, the first 3 digits indicate the day of the year and the last digit is the year. A date code of 1987 would indicate the car was made on the 198th day of 2017 (July 17). A code of 0250 would be the 25th day of 2010 (or 2020; depending on the car). Date codes only indicate when a specific car was made.