If I wanted to be entirely unambiguous, I'd say some thing like "has to be sent ahead of ...". Then again, in some cases the ambiguity is irrelevant, regardless of which convention governed it, if a bottle of milk said "Best file used by August tenth", you couldn't get https://titusjvdkq.thebindingwiki.com/8359131/not_known_details_about_best_prices_for_lumber