What is the latest (full) day you are able to sign for your package before departure?
출발 전에 우편물을 수취하고 확인 서명을 하실 수 있는 가장 늦은 날짜(종일)가 언제입니까?
->The term ‘latest (full) day’ delivers a dictionary meaning so the meaning of the superlative is not clear. The bracketed term ‘full’ is even more ambiguous if it means ‘last day’ or ‘all day long.’
->The date format is not consistently spaced. All inconsistencies in websites make the overall quality low.