N.Y. Comp. Codes R. & Regs. tit. 1, § 276.3 – Codes.

(a) Each container of potentially hazardous food, as defined hereinafter, shall be marked with an identifying code which shall be permanently visible to the naked eye.
1. (1) Where the container does not permit the code to be embossed or inked, the label or other similar marking device may be legibly perforated or otherwise marked, provided that such label is securely affixed to the product container in a manner satisfactory to the commissioner.
2. (2) The required identification shall identify in code the establishment where packed and the period during which packed.
3. (3) The packing period shall be changed with sufficient frequency to enable identification of lots during their sale and distribution.
4. (4) Packing period codes may be changed on the basis of one of the following: intervals of every four to five hours; personnel shift changes; or batches, provided the containers comprising such batch do not extend over a period of more than one personnel shift.
  (b) Definitions.
5. (1) Potentially hazardous food shall mean any perishable food which consists in whole or in part of milk or milk products, eggs, poultry, fish, shellfish or other ingredients capable of supporting rapid and progressive growth of infectious or toxigenic microorganisms.
6. (2) Perishable food shall mean any food of such type or in such condition as may spoil.
7. (3) Home processed food within the context of this Part shall mean any food processed in a private home or residence using only the ordinary kitchen facilities of that home or residence which are also used to prepare food for the owner thereof, his family, nonpaying guests and household and farm employees who reside therein, but shall exclude potentially hazardous foods as defined in this Part or thermally processed low-acid foods packaged in hermetically sealed containers as covered by Part 277 of this Chapter and acidified foods packed in closed containers, including but not limited to pickles and relishes prepared from low-acid fruits, vegetables, poultry, meat, meat products, fish or seafood.