On the basis of a chronology developed after a review of the datable events in Xunzi's life, his career is divided into seven periods which characterize distinct phases of his intellectual development, some well-attested, others poorly understood. Within his works there are a number of clues, principally conversations he has with historical figures or discussions of and allusions to historical events, which allow some books, or passages within books, to be dated with confidence. These provide a general framework for the development of his ideas. Combining these with the seven phases of his career, makes possible the identification of sixteen criteria that can be used to date his various books and work out the details of his intellectual development. Using these criteria a tentative dating of twenty-six of his thirty-two books is proposed.