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If the code uses letters, the letter A represents January and each subsequent letter represents the next month, ending with L for December.
Examine the number to determine if the manufacturer uses a Julian date, which is a number that states the number of days since the first day of the current year.
“Closed Dating” is a code that consists of a series of letters and/or numbers applied by manufacturers to identify the date and time of production. Except for infant formula, product dating is not required by Federal regulations.The code may use the standard month (M), day (D) and year (Y) system. Remember that the month digits can only be from 01 to 12 and that the day digits can only be between 01 and 31. If the code does not resemble either of the previous codes, it is most likely using the Julian Calendar, which assigns a number for each day of the year from 1 to 365. The year will usually be listed with one or two numbers. For example the 123rd day of 2000 must be entered as 00123.Format the cell as TEXT before entering the data, or enter an apostrophe before the Julian date -- e.g., '00123.