Orson F. Whitney reiterates Joseph's teachings about Adam being the Ancient of Days from Daniel 7.
Orson F. Whitney, "The Aaronic Priesthood," The Contributor 6, no. 11 (August 1885): 403
But the indomitable spirit of God's prophet was not to be subdued. He next sough out an asylum for the Saints who were en route from Kirtland, and we next hear of the organizatoin of the Stake of Adam-ondi-Ahman in Daviess County, Missouri. The central point was called Spring Hill by the people of that neighborhood, but Joseph re-christened it Adam-ondi-Ahman, having been informed by the Lord that it was the identical spot where Adam, the father of the human family, would come to visit his people in the last days, in other words, where the Ancient of Days would sit, as foretold by the Prophet Daniel. This fact was made known on the nineteenth of May, 1838.