Most modern scholars believe that Revelation was written around AD 95. Obviously, if Revelation was written after AD 70, then the book could not be a prophecy of the destruction of Jerusalem.
The arguments concerning the date of Revelation are very technical, on both sides. Nevertheless, there is one fairly obvious point in favor of a pre-AD 70 date.
Revelation 17:10 tells us when the book was written.
“There are also seven kings. Five have fallen, one is, and the other has not yet come. And when he comes, he must continue a short time” (Revelation 17:10).
This verse is referring to seven kings, who are emperors of Rome. Five have fallen, one is, and the other has yet to come. This means that five have died. The sixth is currently reigning. The seventh is not yet ruling.
Claudius was the fifth emperor of Rome, and he died in AD 54. Nero was the sixth emperor, and he reigned from AD 54-68. The book of Revelation was written during his Nero’s reign.
Kenneth Gentry has written an entire book, Before Jerusalem Fell, defending a pre-AD 70 dating of the book of Revelation. He compiles a ton of evidence that many find convincing.
At the end of the day, neither side can absolutely prove when Revelation was written. It is best to keep an open mind, to study the contents of the book, and to see what the book points us toward.
As we will see throughout this study and especially this morning, the content of Revelation itself not only fits in a pre-AD 70 time period, but it only fits in a pre-AD 70 time period.