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
Province of Achaia
The renewed regulation of the affairs of Greece was entrusted to a commission of ten senators in concert with the consul Mummius, who left behind him on the whole a blessed memory in the conquered country. Doubtless it was, to say the least, a foolish thing in him to assume the name of "Achaicus" on account of his feats of war and victory, and to build in the fulness of his gratitude a temple to Hercules Victor; but, as he had not been reared in aristocratic luxury and aristocratic corruption but was a "new man" and comparatively without means, he showed himself an upright and indulgent administrator.
The statement, that none of the Achaeans perished but Diaeus and none of the Boeotians but Pytheas, is a rhetorical exaggeration: in Chalcis especially sad outrages occurred; but yet on the whole moderation was observed in the infliction of penalties. Mummius rejected the proposal to throw down the statues of Philopoemen, the founder of the Achaean patriotic party; the fines imposed on the communities were destined not for the Roman exchequer, but for the injured Greek cities, and were mostly remitted afterwards; and the property of those traitors who had parents or children was not sold on public account, but handed over to their relatives.
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Reference address : https://www.ellopos.net/elpenor/rome/4-01-gracchi.asp?pg=82