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
Nevertheless, not only did Marcellus stain his military honour by permitting a general pillage of the wealthy mercantile city, in the course of which Archimedes and many other citizens were put to death, but the Roman senate lent a deaf ear to the complaints which the Syracusans afterwards presented regarding the celebrated general, and neither returned to individuals their pillaged property nor restored to the city its freedom.
Syracuse and the towns that had been previously dependent on it were classed among the communities tributary to Rome--Tauromenium and Neetum alone obtained the same privileges as Messana, while the territory of Leontini became Roman domain and its former proprietors Roman lessees--and no Syracusan citizen was henceforth allowed to reside in the "island," the portion of the city that commanded the harbour.
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Reference address : https://www.ellopos.net/elpenor/rome/3-06-war-hannibal-cannae-zama.asp?pg=19