All Bible scholars agree on this.
The Book of Daniel - Quartz Hill School of Theology
www.
theology.edu/biblesurvey/
daniel.htm
The Book of
Daniel. I. Title. The book of
Daniel is named after the main protagonist throughout; unlike his friends, who are remembered by their Babylonian names rather than their Hebrew names, and unlike Esther, who is likewise remembered for her Persian (or Aramaic) name, rather than her Hebrew name,
Daniel, although given a Babylonian name, is not well remembered by it (Belteshazzar).
Excerpt:
The author of the book is Daniel, although many modern critics would try to date the book much later, to the fifth or fourth century BC; the reason for such a late date though is primarily a result of the presuppositional determination that predictive prophesy is not possible; therefore, the "prophesies" are so accurate in Daniel, not because he was inspired by God, but because the author (whomever he might be) wrote them after the events described had happened.