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
Destruction of Carthage
But by far the larger portion of the city still remained standing. We may believe that Scipio desired its preservation; at least he addressed a special inquiry to the senate on the subject. Scipio Nasica once more attempted to gain a hearing for the demands of reason and honour; but in vain. The senate ordered the general to level the city of Carthage and the suburb of Magalia with the ground, and to do the same with all the townships which had held by Carthage to the last; and thereafter to pass the plough over the site of Carthage so as to put an end in legal form to the existence of the city, and to curse the soil and site for ever, that neither house nor cornfield might ever reappear on the spot.
The command was punctually obeyed. The ruins burned for seventeen days: recently, when the remains of the Carthaginian city wall were excavated, they were found to be covered with a layer of ashes from four to five feet deep, filled with half-charred pieces of wood, fragments of iron, and projectiles. Where the industrious Phoenicians had bustled and trafficked for five hundred years, Roman slaves henceforth pastured the herds of their distant masters. Scipio, however, whom nature had destined for a nobler part than that of an executioner, gazed with horror on his own work; and, instead of the joy of victory, the victor himself was haunted by a presentiment of the retribution that would inevitably follow such a misdeed.
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Reference address : https://www.ellopos.net/elpenor/rome/4-01-gracchi.asp?pg=65