Revelation is a spiritual book, and because of this it is timeless. It deals with spiritual conditions that exist within every age of time.
But additionally, Revelation explains that there will be a completion of the full revelation, including an explanation of historical time placement, that God wants mankind to have, in the final days.
“But in the days of the voice of the seventh angel, when he shall begin to sound, the mystery of God should be finished, as he hath declared to his servants the prophets.” ~ Revelation 10:7
The voice of the seventh trumpet angel is today. No one knows the final last day. Jesus told us himself that only the Father knows that day. But in the final days, God has revealed what has happened in the past that affected the church. And he wants the church to know.
So with that thought and purpose in mind, the Lord has burdened me to fully explain the Revelation Historical Timeline in one article. It is rather long, but it is quite complete.
You can read it here at the link: Revelation Historical Timeline.