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The day of the year, as three digits.
Also known as: Ordinal date code, Day-of-year code
The product code giving a date as the numbered day within the year.
Gives the date of production as the numbered day of the year.
Contexts: Packaging, Public information
Compact and unambiguous across languages and date-order conventions, which is why it survives on products traded internationally where a written date could be read two ways.
Contexts: Packaging, Public information
Not the same as the Julian day number used in astronomy, which counts continuously from a fixed epoch; the shared name is a genuine source of confusion between the two.
Contexts: Packaging, Public information
Three digits from one to three hundred and sixty-six, often preceded by one or two digits for the year, printed or laser-marked on the pack.