Please note that Mommsen uses the AUC chronology (Ab Urbe Condita), i.e. from the founding of the City of Rome. You can use this reference table to have the B.C. dates
From: The History of Rome, by Theodor Mommsen
Translated with the sanction of the author by William Purdie Dickson
The epoch, at which this transformation of Carthage into the capital of Libya took place, admits the less of being determined, because the change doubtless took place gradually. The author just mentioned names Hanno as the reformer of the nation. If the Hanno is meant who lived at the time of the first war with Rome, he can only be regarded as having completed the new system, the carrying out of which presumably occupied the fourth and fifth centuries of Rome.
The flourishing of Carthage was accompanied by a parallel decline in the great cities of the Phoenician mother-country, in Sidon and especially in Tyre, the prosperity of which was destroyed partly by internal commotions, partly by the pressure of external calamities, particularly of its sieges by Salmanassar in the first, Nebuchodrossor in the second, and Alexander in the fifth century of Rome. The noble families and the old firms of Tyre emigrated for the most part to the secure and flourishing daughter-city, and carried thither their intelligence, their capital, and their traditions. At the time when the Phoenicians came into contact with Rome, Carthage was as decidedly the first of Canaanite cities as Rome was the first of the Latin communities.
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Reference address : https://www.ellopos.net/elpenor/rome/3-01-carthage.asp?pg=18