If I planned to be wholly unambiguous, I might say some thing like "must be shipped just before ...". Alternatively, occasionally the ambiguity is irrelevant, regardless of which convention ruled it, if a bottle of milk mentioned "Best f used by August 10th", you couldn't get me to drink https://premium-lumbers-for-sale19516.59bloggers.com/36895472/a-secret-weapon-for-best-prices-for-lumber-near-me