YY DDD = year year day day day
Where:
YY = two digits representing the year in which the product was manufactured, and
DDD = three digits representing the day of the year on which the product was manufactured, with 001 representing the first day of the year, 002 representing the second day of the year, and so forth ('i.e.' the Julian date)
N.Y. Comp. Codes R. & Regs. Tit. 6 §§ 235-6.1