If I wanted to be completely unambiguous, I would say some thing like "must be delivered ahead of ...". Conversely, in some cases the ambiguity is irrelevant, no matter which Conference governed it, if a bottle of milk claimed "Best f used by August tenth", You could not get https://premiumlumbersforsale64062.wikiconversation.com/7412923/5_essential_elements_for_lumber_for_sale_online