Ante-Nicene Fathers Volume I
Irenaeus (130-202)
"Against Heresies"
Then, when He had raised Lazarus from the dead, and plots were formed against Him by the Pharisees, He withdrew to a city called Ephraim; and from that place, as it is written, “He came to Bethany six days before the Passover,” and going up from Bethany to Jerusalem, He there ate the Passover, and suffered on the day following. Now, that these three occasions of the Passover are not included within one year, every person whatever must acknowledge. And that the special month in which the Passover was celebrated, and in which also the Lord suffered, was not the twelfth, but the first, those men who boast that they know all things, if they know not this, may learn it from Moses. Their explanation, therefore, both of the year and of the twelfth month has been proved false, and they ought to reject either their explanation or the Gospel; otherwise [this unanswerable question forces itself upon them], How is it possible that the Lord preached for one year only?
Ante-Nicene Fathers Volume II
Clement of Alexandria (150-215)
“The Stromata, or Miscellanies”
From Julius Cæsar, therefore, to the death of Commodus, are two hundred and thirty-six years, six months. And the whole from Romulus, who founded Rome, till the death of Commodus, amounts to nine hundred and fifty-three years, six months. And our Lord was born in the twenty-eighth year, when first the census was ordered to be taken in the reign of Augustus. And to prove that this is true, it is written in the Gospel by Luke as follows: “And in the fifteenth year, in the reign of Tiberius Cæsar, the word of the Lord came to John, the son of Zacharias.” And again, in the same book: “And Jesus was coming to Zacharias.” And again, in the same book: “And Jesus was coming to His baptism, being about thirty years old,” and so on. And that it was necessary for Him to preach only a year, this also is written: “He hath sent Me to proclaim the acceptable year of the Lord.” This both the prophet spake, and the Gospel. Accordingly, in fifteen years of Tiberius and fifteen years of Augustus; so were completed the thirty years till the time He suffered. And from the time that He suffered till the destruction of Jerusalem are forty-two years and three months; and from the destruction of Jerusalem to the death of Commodus, a hundred and twenty-eight years, ten months, and three days. From the birth of Christ, therefore, to the death of Commodus are, in all, a hundred and ninety-four years, one month, thirteen days. And there are those who have determined not only the year of our Lord’s birth, but also the day; and they say that it took place in the twenty-eighth year of Augustus, and in the twenty-fifth day of Pachon. And the followers of Basilides hold the day of his baptism as a festival, spending the night before in readings.
And they say that it was the fifteenth year of Tiberius Cæsar, the fifteenth day of the month Tubi; and some that it was the eleventh of the same month. And treating of His passion, with very great accuracy, some say that it took place in the sixteenth year of Tiberius, on the twenty-fifth of Phamenoth; and others the twenty-fifth of Pharmuthi and others say that on the nineteenth of Pharmuthi the Saviour suffered. Further, others say that He was born on the twenty-fourth or twenty-fifth of Pharmuthi.
Ante-Nicene Fathers Volume III
Tertullian (160-230)
"Answer to the Jews"
And the suffering of this “extermination” was perfected within the times of the lxx hebdomads, under Tiberius Cæsar, in the consulate of Rubellius Geminus and Fufius Geminus, in the month of March, at the times of the passover, on the eighth day before the calends of April, on the first day of unleavened bread, on which they slew the lamb at even, just as had been enjoined by Moses.Tertullian And the suffering of this “extermination” was perfected within the times of the lxx hebdomads, under Tiberius Cæsar, in the consulate of Rubellius Geminus and Fufius Geminus, in the month of March, at the times of the passover, on the eighth day before the calends of April, on the first day of unleavened bread, on which they slew the lamb at even, just as had been enjoined by Moses.
Ante-Nicene Fathers Volume V
Hippolytus (170-236)
"Commentary on Daniel"
For the first appearance of our Lord in the flesh took place in Bethlehem, under Augustus, in the year 5500; and He suffered in the thirty-third year.
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The Ante-Nicene Fathers (10 Volume Set)
Connected study article: December 25: Christian Or Pagan Origin?