The prophecies in Daniel are parallel. However you interpret these prophecies, remember they are parallel prophecies, and everything has to fit. Daniel 2 has to fit; Daniel 7 has to fit; Daniel 8 has to fit; and Daniel 11 and 12 have to fit.
The 1843 (eventually corrected to 1844) date of William Miller’s message was derived from the study of prophecy, especially the prophecy in Daniel 8:13, 14. The critics of Adventism have taken advantage of the average person’s lack of knowledge about several terms to introduce confusion, instead of understanding, concerning the fulfillment of this prophecy.