It is conventionally held by many if not most scholars that Revelation was written after the year 90 AD.  This is based on a quote from Eusebius of Irenaeus that he was jailed during the reign of Domitian.  But wait.....there was another emporer with almost the same named....Called Domitius, also called Nero.  Those names are so close, that I'd have to see how it appeared in the original Greek or Latin.  After all, Case grammar caused names to change at the end, and Latin worked a bit different from Greek.  So these two names could have easily gotten confused.

Many Aramaic / Syriac copies of Revelation claim in the intro that John / Yochanan was put on the isle of Patmos by "Nero Caesar"  So it could have been written around 68 or 69 AD.

Whatever the case, it may not matter a whole lot.  But I saw something on this and thought I'd pass it on.

Shalom,

Joe