Answer the question. When was the NT (not the Old Testament) compiled and agreed upon by the early Church? We are asking for a date.
Don't have a date...The last Apostle to write was John...The book of Revelation...The book of Revelation goes up thru the final judgement and off into Glory...That's the end of the canon...
How about the first century for the New Testament.....and prior to that...... 400/500 B.C. for the old.
The Old Testament canon was closed with Ezra and Nehemiah upon the return from Babylonian captivity by the Tribes of Judah, Benjamin and a portion of Levi. This, of course, would not include the spurious Deuterocanonicles.
Peter canonizes all of Paul's writings [2 Peter 3:15-16] around 60 A.D. and we are led to believe that Paul has acquired most of the early Churches scriptures by a few years later (mid sixties) as he awaits his fate in a Roman prison [2 Timothy 4:13]. This probably does not include the writings of John, but shortly after the death of Paul, Timothy and Mark would have seen to it that the "Parchments and the Scrolls" would have found their way to the last living Apostle. From there on it was the responsibility of the Greeks to preserve the canon.
Because of this statement in scripture, [Romans 3:1-2] What advantage, then, is there in being a Jew, or what value is there in circumcision? Much in every way! First of all, they have been entrusted with the very words of God..... we must always look to the Jews for the canon.
As has been pointed out by Iscool, The Lord himself, told us to look to The Law, The Prophets and The Psalms [Luke 24:44-45] and this has been confirmed by the Jewish historian, Josephus....the actual number of books considered scripture by the Hebrews.
[Isaiah 8:16] tells us: Bind up the testimony and seal up the law among my disciples.
Mark, upon bringing all of Paul's scrolls to him would have included Peter's writings also since he, Mark, was the actual scribe. The Book of Matthew, written first and in the Hebrew, would have already been among Paul's collection. Of course, Paul's companion, Luke [2 Timothy 4:11}, was the author of Acts and the Gospel that bears his name and these writings would have also been with Paul and ushered into the safe hands of Mark and Timothy for delivery to John.
So....by the end of the first century the Greeks would have been in possession of all the sacred writings and unlike the Church of God, they were free to remain in their homeland, unpersecuted and able to treasure, preserve and copy the Holy Scriptures.
So...to answer your question....when was the New Testament canonized (compiled and agreed upon), the 27 books were being copied and distributed to the churches in Greece and the Holy land by the end of the first century. Paul, Peter and John would have been the final canonizers and thus put the New writings on an equal footing with that of the old. John, we know, gives a final warning in his Revelation that everything is now complete and not to add or take anything away [Revelation 22:18-19].
The Early Church Fathers quoted these books so much that all of the New Testament, except for eleven chapters, can be reconstructed from their quotations.
Catholics who receive salvation by faith in the finished work of Jesus Christ are saved. Those that add works have not saving faith and are not saved. The Roman Catholic Church is not part of the church of Jesus Christ but I know catholics who have Christ. I also know and have met catholics that only hope to enter heaven and put their faith in something other than the finished work of Jesus Christ on the cross, such as purgatory. It is more than sad it is evil and God will not be mocked by this religion of man.