"A significant case can be built to establish the early dating of the Gospels. It starts by establishing the authorship date for the Book of Acts.
---There are several missing historical events in Acts, including the destruction of the Temple (c. 70AD), the siege of Jerusalem (c. 68-70AD) and the deaths of Paul (64-67AD), Peter (64-67AD) and James (61AD).
The absence of these events is reasonable if the Book of Acts was written no later than 60AD. Luke wrote two New Testament books; he wrote his Gospel prior to the Book of Acts.
The only question is, how much earlier did he write the Gospel? I think there is good evidence support a dating in the early 50’s based on internal evidence in Paul’s letters.
Paul appears to have quoted Luke’s Gospel twice; in 1 Timothy 5:18 For the scripture saith, Thou shalt not muzzle the ox that treadeth out the corn. And, The laborer is worthy of his reward. (written in 63-64AD) he quoted ....for the laborer is worthy of his hire Luke 10:7, and in 1 Corinthians 11:23-26 For I have received of the Lord that which also I delivered unto you, That the Lord Jesus the same night in which he was betrayed took bread: And when He had given thanks, He brake it, and said, Take, eat: this is My body, which is broken for you: this do in remembrance of Me. After the same manner also He took the cup, when He had supped, saying, This cup is the new testament in My blood: this do ye, as oft as ye drink it, in remembrance of Me. For as often as ye eat this bread, and drink this cup, ye do shew the Lord's death till He come (written between 53-57AD) he quoted And He took bread, and gave thanks, and brake it, and gave unto them, saying, This is My body which is given for you: this do in remembrance of Me. Likewise also the cup after supper, saying, This cup is the new testament in My blood, which is shed for you. Luke 22:19-20.
---This means Paul would’ve had access to Luke’s Gospel as early as 53AD. Luke (in the first chapter of the Gospel), told Theophilus: “Therefore, since I myself have carefully investigated everything from the beginning, it seemed good also to me to write an orderly account for you…” This term, “orderly” seems to be extraneous, unless Luke was responding to common first century knowledge about a “disorderly” Gospel.
Papias, a first century bishop, famously claimed Mark’s Gospel (written based on the preaching of Peter in Rome) was accurate, if not orderly.
Luke appears to have referenced this common knowledge in the opening lines of his Gospel, and Luke quoted Mark’s Gospel more than any other source.
But this means the information in Mark’s Gospel is even earlier than Luke’s, placing Mark in the late 40’s or early 50’s. These early dates for both Luke and Mark make it highly unlikely they could have been written without vetting from those who were there and saw the truth about Jesus."
J.W. Wallace