I'm a candy collector collecting old candy wrappers to build my vintage candy wrapper collection for all to view. Freshness Code, Date Codes, Stamp Code, Expire Date or Manufactures Code A lot of the smaller companies just stamp a Best Before date on the package. NECCO – Made Date 307191 – 3 is Mass. Company, 071 is the 71st day of the year, 9 is the year 2009 and 1 is the shift they were made on which is the 1st. Hershey – Expire Date First number is year (0-9) second letter is month (A-L, which is Jan-Dec). However, some codes are like JAN2010, which needs no explanation. Mars – Made Date First digit is year next two digits are the week of the year it was made Nestle – Made Date They use Julian code so the first four digits are (1 digit year followed by 3 digit day of the year).