The date code won't be normally (easily) seen while installed in a truck. It is on top of the engine block, behind the right side head, immediately forward of the tranny bell housing. Perhaps a contortionists would do better than I. Add to that, locating it is far from actually reading it, especially on a dirty engine.

Once we run out of engine codes, we won't need any more. The world will end. It seems this year is the last year, so live it up!