Please view this link:  http://www.christiancourier.com/articles/1552-when-was-the-book-of-revelation-written

It’s more important to be right with the Lord than right on every point….but being lead about by every wind and doctrine is also unacceptable. Here is a dating of the book of Revelations which is most widely excepted by scholars and the Early Church.

AUTHOR AND DATE
Four times the author identifies himself as John (1:1, 4, 9; 22:8). Early tradition unanimously identified him as John the apostle, author of the fourth gospel and three epistles. For example, important second century witnesses to the Apostle John’s authorship include Justin Martyr, Irenaeus, Clement of Alexandria, and Tertullian. Many of the book’s original readers were still alive during the lifetimes of Justin Martyr and Irenaeus—both of whom held to apostolic authorship.

There are differences in style between Revelation and John’s other writings, but they are insignificant and do not preclude one man from writing both. In fact, there are some striking parallels between Revelation and John’s other works. Only John’s gospel and Revelation refer to Jesus Christ as the Word (19:13; Jn 1:1). Revelation (1:7) and John’s gospel (19:37) translate Zec 12:10 differently from the Septuagint, but in agreement with each other. Only Revelation and the Gospel of John describe Jesus as the Lamb (5:6, 8; Jn 1:29); both describe Jesus as a witness (cf. 1:5; Jn 5:31, 32).

Revelation was written in the last decade of the first century (ca. a.d. 94–96), near the end of Emperor Domitian’s reign (a.d. 81–96). Although some date it during Nero’s reign (a.d. 54–68), their arguments are unconvincing and conflict with the view of the early church. Writing in the second century, Irenaeus declared that Revelation had been written toward the end of Domitian’s reign. Later writers, such as Clement of Alexandria, Origen, Victorinus (who wrote one of the earliest commentaries on Revelation), Eusebius, and Jerome affirm the Domitian date.
The spiritual decline of the 7 churches (chaps. 2, 3) also argues for the later date. Those churches were strong and spiritually healthy in the mid-60s, when Paul last ministered in Asia Minor. The brief time between Paul’s ministry there and the end of Nero’s reign was too short for such a decline to have occurred. The longer time gap also explains the rise of the heretical sect known as the Nicolaitans (2:6, 15), who are not mentioned in Paul’s letters, not even to one or more of these same churches (Ephesians). Finally, dating Revelation during Nero’s reign does not allow time for John’s ministry in Asia Minor to reach the point at which the authorities would have felt the need to exile him.

MacArthur, John: The MacArthur Study Bible : New American Standard Bible. Nashville : Thomas Nelson Publishers, 2006

So if a Peterist or A-millenniumist tells you none of this matters and Jesus will come when He comes then they can lead you down any false doctrine trail. But the Bible and Jesus give us a specific road map and things to look for. Look to the Bible…Revelations and the End Time Prophecies are either being Fulfilled or yet to be Fulfilled.