Here are a couple of examples of date codes. 1A10M translates to Jan 10th. 2C21M translates to Feb 21st. The first set of numbers are 1 through 12, so that has to be the month, I have never seen one higher than 12. The second set of letters is always an A, B, or C, so maybe that stands for 3 shifts a day? I have never seen a D or higher. The 3rd set of numbers is 1 through 31, so that has to be the day of the month. I have never seen anything higher than 31. The 4th set of letters are G, M, J, and B that I have seen, I have no idea what they stand for.
