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
Difference of the Italian and the Greek Character
It was otherwise in the mental domain. The great problem of man--how to live in conscious harmony with himself, with his neighbour, and with the whole to which he belongs--admits of as many solutions as there are provinces in our Father's kingdom; and it is in this, and not in the material sphere, that individuals and nations display their divergences of character. The exciting causes which gave rise to this intrinsic contrast must have been in the Graeco-Italian period as yet wanting; it was not until the Greeks and Italians had separated that that deep-seated diversity of mental character became manifest, the effects of which continue to the present day. The family and the state, religion and art, received in Italy and in Greece respectively a development so peculiar and so thoroughly national, that the common basis, on which in these respects also the two peoples rested, has been so overgrown as to be almost concealed from our view.
That Greek character, which sacrificed the whole to its individual elements, the nation to the township, and the township to the citizen; which sought its ideal of life in the beautiful and the good, and, but too often, in the enjoyment of idleness; which attained its political development by intensifying the original individuality of the several cantons, and at length produced the internal dissolution of even local authority; which in its view of religion first invested the gods with human attributes, and then denied their existence; which allowed full play to the limbs in the sports of the naked youth, and gave free scope to thought in all its grandeur and in all its awfulness;--and that Roman character, which solemnly bound the son to reverence the father, the citizen to reverence the ruler, and all to reverence the gods; which required nothing and honoured nothing but the useful act, and compelled every citizen to fill up every moment of his brief life with unceasing work; which made it a duty even in the boy modestly to cover the body; which deemed every one a bad citizen who wished to be different from his fellows; which regarded the state as all in all, and a desire for the state's extension as the only aspiration not liable to censure,--who can in thought trace back these sharply-marked contrasts to that original unity which embraced them both, prepared the way for their development, and at length produced them? It would be foolish presumption to desire to lift this veil; we shall only endeavour to indicate in brief outline the beginnings of Italian nationality and its connections with an earlier period--to direct the guesses of the discerning reader rather than to express them.
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Reference address : https://www.ellopos.net/elpenor/rome/1-02-earliest-migrations-italy.asp?pg=21