There are so many problems with Daniel.
It is historically inaccurate, including the dating of Daniel's exile, Nebuchadnezzar's madness (confused with Nabonidus), wrong name of Babylon's last ruler and Persia's first ruler, etc., etc., etc.
The LXX is so different to the MT. (The Christians preferred Theodotian's translation to the LXX. Theodotian's is closer to the MT.)
The "furnace" and "lions' den" stories are so far fetched that one wonders if the ancients thought they were literal histories or whether they were parables teaching that God's people would survive despite their current problems (under Antiochus Epiphanes). (The stories of chapters 2 to 4 form an overall pattern, thus showing the moral being taught is that Yahweh is supreme, giving power to whoever it pleases. This was good news to the 2nd century readers.)
The writings can only be understood in the context of the Maccabeans.
When Jeremiah's prediction of Jewish restoration was obviously not coming to pass, the 2nd century writers changed the "70 years" to "7 times 70 years" to bring it down to their own times.
Doug