More directly, imagine writing a thesis on the future of terrorism in America and failing to mention the Manhattan Massacre. Imagine that you are reading a history concerning Jewish struggles in Nazi Germany and find no mention whatsoever of the Holocaust.
Most scholars regard there being only two possible dates. Leon Morris explores this adequately in his Tyndale Commentary series volume on Revelation, and I recommend that this widely available commentary be read. I believe this parallels Matthew 25 where we find several long-time references (the Bridegroom was "delayed", vs. At the end of Revelation 20 a fire appears from heaven which delivers the godly.
In the case of most books of the Bible, determining the date of its authorship, while certainly important, is not necessarily crucial to its interpretation. I believe this is the physical return of Christ, which is also described in 2Thessalonians 1:7-8 as being "fire from heaven".
This continued up until the time of Jerusalem’s destruction in 70AD.
Empire sanctioned persecution against the Church was being intensified since 64AD when Nero had ordered Christians to be put to death (usually by beheading).
For it has not been long since it was seen, but almost in our own generation, about the end of Domitian's reign."And to give you confidence, when you have thus truly repented, that there remains for you a trustworthy hope of salvation, hear a story that is no mere story, but a true account of John the apostle that has been handed down and preserved in memory.