date certainglossary / DATE CERTAIN date certain. A fixed or appointed day; a specified day, esp. a date fixed by an instrument such as a deed. Cf. TIME CERTAIN(1). — Also termed (in French law) date certaine (dat sair-tayn). 词条贡献者 译员雪梅,国际知名法学院劳动法专业,专注翻译各种与劳动雇佣有关的法律文件。