The Book of Deuteronomy is the fifth book of the Pentateuch in the Old Testament of the Bible. Deuteronomy brings us to the end of the wilderness journey, where Moses is preparing the children of Israel for entering into the Promised Land before he dies.
Throughout the Book of Deuteronomy Moses is said to be speaking to the people. In many cases it is being written in third person, with Moses as the speaker, making it possible that a scribe could have written on Moses's behalf. Otherwise, Moses would've referred to all of the events in the third person. Throughout the book, attention is given to the culture and surroundings of the time. This indicates that the account is contemporary to the events. Therefore, the date of this book can be put at 1407 BC.