I used cross references with other NT documents. Doesn't textual evidence mean anything to you?
You need another external evidence as an anchor?
Consider the congregations in Asia Minor that Paul started. They were originally 9. Ephesus, Pergamon, Philadelphia, Sardis, Thyatira, Smyrna, Colosse, Hierapolis, and Laodicea. It would be natural that Jesus would address messages to all these congregations. But Colosse and Hierapolis are missing. Why?
Roman historian Tacitus records a devastating earthquake that destroyed the three neighbouring cities of Colosse, Hierapolis and Laodicea, as having taken place on the 7th year of emperor Nero. This amounts to 61 CE. Of the three cities, only Laodicea was soon rebuilt, again according to Tacitus, while the others remained uninhabited. On the other hand, the prophetic message delivered by Jesus to the congregation of Philadelphia, it warns about the hour of tribulation that was "about to come to the world", a reference to persecution. Nero unleashed the persecution against the Christians in AD 64. So, the part of Revelation that deals with the seven messages to the seven congregations (The last part to be received) can indeed be anchored between the dates 61 and 64 AD, more likely 62/63 AD.
Eden