The production lot number does not represent the date of production.

The production lot number is the production number of each batch of product. In order to trace the responsibility of this batch of products after the fact, to avoid confusion, so each batch of products have a corresponding batch number. It is used to identify the "batch" of a set of numbers or letters and numbers.

Generally by the production time of the year, month and day of each two-digit composition, but there are exceptions. The expiration date is calculated from the date of production (based on the production lot number), so according to the lot number you can know whether to buy the product within the expiration date.

The production date is the date and time when the goods have completed all the processes on the production line, been inspected and packaged into finished products that can be sold on the market. Nowadays, most companies are gradually unifying the production date and production lot number of their products. In addition, the current mandatory national standard GB 7718-2004 "General Principles for the Labeling of Prepackaged Foods" gives a clear definition of the production date (manufacturing date): "The date on which a food product becomes a final product. "

Article 76 of the Good Manufacturing Practice (GMP) promulgated by the Ministry of Health in 1992 defines the meaning of the term "batch number": a set of numbers or letters and numbers used to identify a "batch". It can be used to trace and review the production history of the batch of drugs. This can be considered as a statutory interpretation of the definition of batch number.

For example: the production lot number S0921010922, representing the date of production: September 21, 2007; expiration date of September 22, 2010.

Note: Letters stand for months: J, F, M, A, Y, E, L, U, S, O, N, D stand for January-December, i.e., months, respectively.

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