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
But it was an impulse still more profound and deep-rooted, which carried the Romans irresistibly into the Greek vortex. Greek civilization still doubtless called itself by that name, but it was Greek no longer; it was, in fact, humanistic and cosmopolitan. It had solved the problem of moulding a mass of different nations into one whole completely in the field of intellect, and to a certain extent also in that of politics; and, now when the same task on a wider scale devolved on Rome, she took over Hellenism along with the rest of the inheritance of Alexander the Great. Hellenism therefore was no longer a mere stimulus or accessory influence; it penetrated the Italian nation to the very core.
Of course, the vigorous home life of Italy strove against the foreign element. It was only after a most vehement struggle that the Italian farmer abandoned the field to the cosmopolite of the capital; and, as in Germany the French coat called forth the national Germanic frock, so the reaction against Hellenism aroused in Rome a tendency which opposed the influence of Greece on principle, in a fashion altogether foreign to the earlier centuries, and in doing so fell pretty frequently into downright follies and absurdities.
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Reference address : https://www.ellopos.net/elpenor/rome/3-13-faith-manners.asp?pg=7