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, however rapidly and vigorously the Latin language and nationality gain ground, they at the same time recognize the Greek nationality as having an entirely equal, indeed an earlier and better title, and enter everywhere into the closest alliance with it or become intermingled with it in a joint development. The Italian revolution, which otherwise levelled all the non-Latin nationalities in the peninsula, did not disturb the Greek cities of Tarentum, Rhegium, Neapolis, Locri.(6)
6. Cf. IV. VII. Second Year of the War
In like manner Massilia, although now enclosed by Roman territory, remained continuously a Greek city and, just as such, firmly connected with Rome. With the complete Latinizing of Italy the growth of Hellenizing went hand in hand. In the higher circles of Italian society Greek training became an integral element of their native culture. The consul of 623, the -pontifex maximus- Publius Crassus, excited the astonishment even of the native Greeks, when as governor of Asia he delivered his judicial decisions, as the case required, sometimes in ordinary Greek, sometimes in one of the four dialects which had become written languages.
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Reference address : https://www.ellopos.net/elpenor/rome/4-12-nationality-religion-education.asp?pg=6