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
In declaring war against Rome--if such was their wish--the statesmen of Tarentum were only doing what they should have done long before; and if they preferred to rest their declaration of war upon the formal pretext of a breach of treaty rather than upon the real ground, no further objection could be taken to that course, seeing that diplomacy has always reckoned it beneath its dignity to speak the plain truth in plain language.
But to make an armed attack upon the fleet without warning, instead of summoning the admiral to retrace his course, was a foolish no less than a barbarous act--one of those horrible barbarities of civilization, when moral principle suddenly forsakes the helm and the merest coarseness emerges in its room, as if to warn us against the childish belief that civilization is able to extirpate brutality from human nature.
And, as if what they had done had not been enough, the Tarentines after this heroic feat attacked Thurii, the Roman garrison of which capitulated in consequence of the surprise (in the winter of 472-473); and inflicted: severe chastisement on the Thurines--the same, whom Tarentine policy had abandoned to the Lucanians and thereby forcibly constrained into surrender to Rome--for their desertion from the Greek party to the barbarians.
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Reference address : https://www.ellopos.net/elpenor/rome/2-07-pyrrhus-rome-italy.asp?pg=17