In the first year of his reign I Daniel understood from the books the number of the years, of which the word of the LORD came to Jeremiah the prophet, that he would accomplish seventy years in the desolations of Jerusalem.
All Commentaries on Daniel 9:2 Go To Daniel 9
Aquinas Study Bible
AD 2017
seventy years: In one sense, which Jeremiah saw, this meant the length of captivity - Daniel does not contradict, but extends the prophecy by taking weeks of years instead of single years, about 70 weeks of years. So we believe that the mixture of references comes from the well-known pattern of multiple fulfillment. (Fr. Most)