Yes, the MDH is assigned in the computer when the body is dropped onto "frame". The Date of Manufacture is when it leaves the line, normally same day or next day. However, 2/28 is a Friday and your "H" is 9pm so it left the line in March, hence, your Date of Manufacture is 3/14.
Ya, alignment marks are probably a less exact guide (maybe) but certainly something to watch for movement. ANY grease, anywhere, any amount = problem.