Advanced Interconnections Corp. (AIC) uses a 4 digit date code label either directly on the product if it fits, or on the packaging if the product is too small. The code has two parts with the first 3 digits signifying the day of the year and the last digit signifying the year.
DDD will be 001 through 366 (366 days in a leap year)
Y will be 0 through 9 (0 for 2000, 2010, 2020 for example, and 9 for 2009, 2019, 2029, etc.)
The date code for July 20th, 2016 is 2026 with July 20th being 202nd day of the year and the year code is 6 for 2016. (2016 is a leap year.)
The date code for January 1, 2010 is 0010 and for December 31, 2010 is 3650.
The code for December 31, 2015, is 3655.
The code for December 31, 2016, is 3666, because 2016 is a leap year.
This day-of-year code is often misnamed as a Julian Date Code, however a Julian Date is actually a continuous count of days since the year 4713 B.C.
Click here for a handy online Day of Year chart.