If I wanted to be entirely unambiguous, I would say anything like "need to be delivered prior to ...". On the flip side, in some cases the ambiguity is irrelevant, it doesn't matter which Conference ruled it, if a bottle of milk explained "Best f used by August 10th", https://angelonxels.wikinstructions.com/1629758/new_step_by_step_map_for_lowest_price_lumber_near_me