Seventy Weeks of Daniel is a 490 year period (w/ an interlude) in which certain events occur having to do with Israel, the Messiah, the Antichrist, & end times.
The Chronology of Daniel
The book of Daniel is not in chronological order. Here is a timeline of known dates and events to assist you in studying the book. The actual chronology is chapters 1-4,7,8,5,6, 9-12