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
Thus the two nations in which the civilization of antiquity culminated stand side by side, as different in development as they were in origin identical. The points in which the Greeks excel the Italians are more universally intelligible and reflect a more brilliant lustre; but the deep feeling in each individual that he was only a part of the community, a rare devotedness and power of self-sacrifice for the common weal, an earnest faith in its own gods, form the rich treasure of the Italian nation. Both nations underwent a one-sided, and therefore each a complete, development; it is only a pitiful narrow-mindedness that will object to the Athenian that he did not know how to mould his state like the Fabii and the Valerii, or to the Roman that he did not learn to carve like Pheidias and to write like Aristophanes. It was in fact the most peculiar and the best feature in the character of the Greek people, that rendered it impossible for them to advance from national to political unity without at the same time exchanging their polity for despotism. The ideal world of beauty was all in all to the Greeks, and compensated them to some extent for what they wanted in reality.
Wherever in Greece a tendency towards national union appeared, it was based not on elements directly political, but on games and art: the contests at Olympia, the poems of Homer, the tragedies of Euripides, were the only bonds that held Greece together. Resolutely, on the other hand, the Italian surrendered his own personal will for the sake of freedom, and learned to obey his father that he might know how to obey the state. Amidst this subjection individual development might be marred, and the germs of fairest promise in man might be arrested in the bud; the Italian gained in their stead a feeling of fatherland and of patriotism such as the Greek never knew, and alone among all the civilized nations of antiquity succeeded in working out national unity in connection with a constitution based on self-government--a national unity, which at last placed in his hands the mastery not only over the divided Greek stock, but over the whole known world.
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Reference address : https://www.ellopos.net/elpenor/rome/1-02-earliest-migrations-italy.asp?pg=28