Now if we consider
Luke 3:1, Tiberius was co-regent with Caesar Augustus from 12 AD, and Jewish method of counting included the first year even if it was only a month.
Therefore:
12 + 15 = 27 AD
Now
Luke 3:23 says Jesus was almost 30 years old, therefore we can summarize Jesus turned 30 after 1 Nisan 27 AD.
Yes, I agree that AD 27 is the correct date for Christ's baptism. But it is not the year for the beginning of Christ's ministry. A careful examination that compares the gospel accounts reveals that there was a certain "season" between Christ's baptism (when the Devil "left Him for
a season") and the beginning year of His ministry in AD 30 with the first miracle at Cana. In between that time, John was "fulfilling his course" of making a people prepared for the Lord's ministry among them.
Acts 24-25 says, "When John had FIRST preached BEFORE His coming the baptism of repentance to all the people of Israel. And
as John fulfilled his course" (at the end of John's ministry before his imprisonment), "he said, "Whom think ye that I am? I am not he. But, behold, there cometh one after me, whose shoes of his feet I am not worthy to loose." At this end of John's ministry, he had already baptized Jesus 3 years before then. That is why John testified to the people in John 1:30-34 of what he had already told them formerly about Jesus, 3 years earlier at Jesus' baptism. "This is He of whom I said,
After me
" (after John had "fulfilled his course") "cometh a man which is preferred before me...And I
have seen
, and
have borne witness" (3 years earlier) "that this is the Son of God."
John did no miracles by comparison (John 10:41). Against this earlier backdrop of John's preparatory teaching of repentance - with
no miracles - Christ's ministry shone forth in a blaze of miraculous signs among the people that caused many to believe on Him, including His disciples (John 2:11 and John 10:41).
Christ Himself announced the beginning of the 70th week in Mark 1:15. This was
after John had been put in prison (when he had "fulfilled his course"), when "Jesus came into Galilee, preaching the gospel of the kingdom of God, And saying, '
The time is fulfilled, and the kingdom of God is at hand: repent ye, and believe the gospel." That was the year AD 30 for the fulfillment of that appointed time. It was the end of the 69th week and the beginning of the 70th week when Christ as the "messenger of the covenant" would "confirm the covenant with many" of Daniel's people for that last intact 70th week.
This means Christ was crucified in AD 33 when He was around 36 years old. Truly a "mid-life crisis" took place for Him.