seen on tv once on one of these cop programmes that you can tell the year and month of a part it was made, ,

can somebody tell me what month and year the glass cover is from what the replaced with my glass that was nicked, becaue ive got a feeling they have nicked it for a taxi,

theres a circle with 1-12 round and the arrrow is pointing inbetween 5-6 and next to the arrow 04 so is it off and 04 plate, i under stand that could of been when the part was made