Douglas F. Kelly's 6 Arguments for Revelation's Early Date

In his partial-preterist commentary on Revelation, Douglas Kelly of Reformed Theological Seminary gives six "indications" that Revelation was written prior to the fall of Jerusalem in 70 AD. Here they are.

1. Coming Soon in Judgment
2. 'Coming in Judgment' (to be distinguished from a final coming)
3. 'This Generation' Shall Not Pass
4. The Jerusalem Temple Still Standing
5. The 'Sixth King' Seems to Have Been Alive
​6. Military Imagery Fits the Jewish War

Kelly's first point sets the stage for the rest. There is an emphasis in Revelation that the events described will happen soon. Here is Kelly's entire first point:

First, the victorious Jesus tells John that he is coming soon in judgment to deal with the situation oppressing the Christians in those seven churches. In verse 1, it says 'which shortly must come to pass'; verse 3, 'for the time is near or at hand'. 'I am coming to you quickly' (2:16). "I am coming quickly' (3:11). 'The third woe is coming quickly' (11:14). 'The things which must shortly take place' (22:6). 'Behold I am coming quickly' (22:7). 'For the time is nigh' (22:10). 'Behold I am coming quickly' (22:20). And if this book was written in the middle sixties, and the Lord came in the destruction of Jerusalem and the death of Nero in 70 AD, then he came within three or four years of it being written. He did what he said he would do. He came quickly. That is one reason to think that this book must have been written before 70 AD. These are what Gary DeMar calls significant 'time texts' in the book of Revelation. They indicate when many of its judgments would happen

To claim that most of the events of Revelation have not yet occurred, or are still in our future, is to fail to take seriously these time texts. "Soon" and "quickly" cannot possibly be made to mean 2000+ years from the time that John wrote Revelation.  In Rev. 22:10 John is told, “Do not seal up the words of the prophecy of this scroll, because the time is near." Daniel however, whose prophecy was fulfilled approximately 400 years after he received it, was told that he should seal up the words of the prophecy until the time of the end (Dan 12:4).  To me, it cannot be logical to say that 400 years is "not near," while maintaining that 2000+ years can still be "near." 

Kelly, Douglas. Revelation: A Mentor Expository Commentary. Ross-shire, Scotland: Mentor, 2012. p. 19-20.