Did you get a false certificate? Purple has been in use since at least 2006. No.-Let me give you an example of the undergraduate number: B060302 147. Among them, B is the academic level classification number, 06 is the year of admission, 030 is the department number, and 2 147 is the core part of the student number. Undergraduate students enrolled in 2007 can be compiled into B070191135; 0 135; 08 ... Now, if you can't make it up yourself, you are a pig born in 1983.