Here is the section in question:
Let's start with the obvious difficulty - the first list that mentions an interest in the 'Savior's birth' with reference to the reigns of various Emperors and a follow up list that doesn't agree:And nothing, in my opinion, after these details, need stand in the way of stating the periods of the Roman emperors, in order to the demonstration of the Saviour's birth. Augustus, forty-three years; Tiberius, twenty-two years; Caius, four years; Claudius, fourteen years; Nero, fourteen years; Galba, one year; Vespasian, ten years; Titus, three years; Domitian, fifteen years; Nerva, one year; Trajan, nineteen years; Adrian, twenty-one years; Antoninus, twenty-one years; likewise again, Antoninus and Commodus, thirty-two. In all, from Augustus to Commodus, are two hundred and twenty-two years; and from Adam to the death of Commodus, five thousand seven hundred and eighty-four years, two months, twelve days.
Some set down the dates of the Roman emperors thus: Caius Julius Caesar, three years, four months, five days; after him Augustus reigned forty-six years, four months, one day. Then Tiberius, twenty-six years, six months, nineteen days. He was succeeded by Caius Caesar, who reigned three years, ten months, eight days; and be by Claudius for thirteen years, eight months, twenty-eight days. Nero reigned thirteen years, eight months, twenty-eight days; Galba, seven months and six days; Otho, five months, one day; Vitellius, seven months, one day; Vespasian, eleven years, eleven months, twenty-two days; Titus, two years, two months; Domitian, fifteen years, eight months, five days; Nerva, one year, four months, ten days; Trajan, nineteen years, seven months, ten days; Adrian, twenty years, ten months, twenty-eight days. Antoninus, twenty-two years, three months, and seven days; Marcus Aurelius Antoninus, nineteen years, eleven days; Commodus, twelve years, nine months, fourteen days.
From Julius Caesar, 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 Caesar, the word of the Lord came to John, the son of 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 Caesar, 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.
We have still to add to our chronology the following, -- I mean the days which Daniel indicates from the desolation of Jerusalem, the seven years and seven months of the reign of Vespasian. For the two years are added to the seventeen months and eighteen days of Otho, and Galba, and Vitellius; and the result is three years and six months, which is "the half of the week," as Daniel the prophet said. For he said that there were two thousand three hundred days from the time that the abomination of Nero stood in the holy city, till its destruction. For thus the declaration, which is subjoined, shows: "How long shall be the vision, the sacrifice taken away, the abomination of desolation, which is given, and the power and the holy place shall be trodden under foot? And he said to him, Till the evening and morning, two thousand three hundred days, and the holy place shall be taken away."
These two thousand three hundred days, then, make six years four months, during the half of which Nero held sway, and it was half a week; and for a half, Vespasian with Otho, Galba, and Vitellius reigned. And on this account Daniel says, "Blessed is he that cometh to the thousand three hundred and thirty-five days." For up to these days was war, and after them it ceased. And this number is demonstrated from a subsequent chapter, which is as follows: "And from the time of the change of continuation, and of the giving of the abomination of desolation, there shall be a thousand two hundred and ninety days. Blessed is he that waiteth, and cometh to the thousand three hundred and thirty-five days."
Flavius Josephus the Jew, who composed the history of the Jews, computing the periods, says that from Moses to David were five hundred and eighty-five years; from David to the second year of Vespasian, a thousand one hundred and seventy-nine; then from that to the tenth year of Antoninus, seventy-seven. So that from Moses to the tenth year of Antoninus there are, in all, two thousand one hundred and thirty-three years.
Of others, counting from Inachus and Moses to the death of Commodus, some say there were three thousand one hundred and forty-two years; and others, two thousand eight hundred and thirty-one years.
And in the Gospel according to Matthew, the genealogy which begins with Abraham is continued down to Mary the mother of the Lord. "For," it is said, "from Abraham to David are fourteen generations; and from David to the carrying away into Babylon are fourteen generations; and from the carrying away into Babylon till Christ are likewise other fourteen generations," -- three mystic intervals completed in six weeks.
I see:Augustus, forty-three years; Tiberius, twenty-two years; Caius, four years; Claudius, fourteen years; Nero, fourteen years; Galba, one year; Vespasian, ten years; Titus, three years; Domitian, fifteen years; Nerva, one year; Trajan, nineteen years; Adrian, twenty-one years; Antoninus, twenty-one years; likewise again, Antoninus and Commodus, thirty-two. In all, from Augustus to Commodus, are two hundred and twenty-two years; and from Adam to the death of Commodus, five thousand seven hundred and eighty-four years, two months, twelve days.
Some set down the dates of the Roman emperors thus: Caius Julius Caesar, three years, four months, five days; after him Augustus reigned forty-six years, four months, one day. Then Tiberius, twenty-six years, six months, nineteen days. He was succeeded by Caius Caesar, who reigned three years, ten months, eight days; and be by Claudius for thirteen years, eight months, twenty-eight days. Nero reigned thirteen years, eight months, twenty-eight days; Galba, seven months and six days; Otho, five months, one day; Vitellius, seven months, one day; Vespasian, eleven years, eleven months, twenty-two days; Titus, two years, two months; Domitian, fifteen years, eight months, five days; Nerva, one year, four months, ten days; Trajan, nineteen years, seven months, ten days; Adrian, twenty years, ten months, twenty-eight days. Antoninus, twenty-two years, three months, and seven days; Marcus Aurelius Antoninus, nineteen years, eleven days; Commodus, twelve years, nine months, fourteen days.
Julius Caesar nothing in the first list and then three years, four months, five days in the second list
Augustus, forty-three years in the first list and then forty-six years, four months, one day in the second list
Tiberius, twenty-two years in the first list and twenty-six years, six months, nineteen days in the second list
Caius, four years in the first list and three years, ten months, eight days in the second list
Claudius, fourteen years in the first list and thirteen years, eight months, twenty-eight days in the second list
Nero, fourteen years in the first list and thirteen years, eight months, twenty-eight days in the second list
Galba, one year in the first list and seven months and six days in the second list
Otho unmentioned in the first list and five months, one day in the second list
Vitellius unmentioned in the first list and seven months, one day in the second list
Vespasian, ten years in the first list and eleven years, eleven months, twenty-two days in the second list
Titus, three years in the first list and two years, two months in the second list
Domitian, fifteen years in the first list and fifteen years, eight months, five days in the second
Nerva, one year in the first list and one year, four months, ten days in the second list
Trajan, nineteen years in the first list and nineteen years, seven months, ten days in the second list
Adrian, twenty-one years in the first list and twenty years, ten months, twenty-eight days in the second list
Antoninus, twenty-one years in the first list and twenty-two years, three months, and seven days in the second list
Antoninus (!) and Commodus, thirty-two in the first list and no corresponding mention of combined years in the second list
no individual mention for Marcus Aurelius Antoninus in the first list and him listed (oddly) as 'Antoninus' nineteen years, eleven days in the second list
and then Commodus, twelve years, nine months, fourteen days in the second again (no individual mention of Commodus in the first list).
The first list concludes "In all, from Augustus to Commodus, are two hundred and twenty-two years" while the second list declares "From Julius Caesar, therefore, to the death of Commodus, are two hundred and thirty-six years, six months"
What is so odd about this is the use of two lists of what must have been well established dates for the Emperors. Surely the lengths of the reigns of the Emperors must have been public knowledge and well established information. But more importantly even if for some reason this information was NOT WELL KNOWN or not easy to come by of what possible what value could it have been for Clement to include two list which vary so much from one another - i.e. 225.5 (adding in the value for Julius Caesar) vs 236.5 for the same measurement?? Surely he was trying to make a point - and what possible point could have been made by arriving at two different numbers for the same date. It would seem to me that the entire section has been obscured by the addition of the second set of numbers for the whole section that follows is off by the same number.