Donald B. Redford

In 1953, the German scholar Gerhard von Rath wrote an influential essay arguing that Joseph's story reads like a piece of Israel's wisdom literature, a polished tale about a wise courtier shaped in the royal court of Solomon.

In 1970, the Canadian Egyptologist Donald Redford published a detailed study arguing that the Egyptian names in the story, Joseph's Egyptian name Zephanath Paneah, his wife Asenath, and her father Potophera, fit the much later Saite period from the 7th century BC onward better than the 2nd millennium.

On that reading, the story was composed later, perhaps during or near the exile.

Others have answered with equal care.