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
Relation of the Italians to the Greeks
These examples selected from a great abundance of analogous phenomena suffice to establish the individuality of the Italian stock as distinguished from the other members of the Indo-Germanic family, and at the same time show it to be linguistically the nearest relative, as it is geographically the next neighbour, of the Greek. The Greek and the Italian are brothers; the Celt, the German, and the Slavonian are their cousins. The essential unity of all the Italian as of all the Greek dialects and stocks must have dawned early and clearly on the consciousness of the two great nations themselves; for we find in the Roman language a very ancient word of enigmatical origin, -Graius-or -Graicus-, which is applied to every Greek, and in like manner amongst the Greeks the analogous appellation --Opikos-- which is applied to all the Latin and Samnite stocks known to the Greeks in earlier times, but never to the Iapygians or Etruscans.
Do you see any typos or other mistakes? Please let us know and correct them
Reference address : https://www.ellopos.net/elpenor/rome/1-02-earliest-migrations-italy.asp?pg=8