If I needed to be completely unambiguous, I'd personally say anything like "need to be shipped just before ...". On the other hand, from time to time the ambiguity is irrelevant, despite which convention ruled it, if a bottle of milk said "Best file used by August tenth", You https://stephensdlsy.jasperwiki.com/6915491/not_known_factual_statements_about_lumber_for_sale_cheap