If I wished to be wholly unambiguous, I'd personally say a little something like "has to be delivered ahead of ...". On the other hand, sometimes the ambiguity is irrelevant, no matter which convention ruled it, if a bottle of milk said "Best f used by August 10th", you https://premium-lumbers-for-sale04283.signalwiki.com/1653246/the_2_minute_rule_for_lumber_prices_near_by