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
All this was a sorry and unskilful patchwork. The view that the original Penates of Rome were preserved not, as had hitherto been believed, in their temple in the Roman Forum, but in the shrine at Lavinium, could not but be offensive to the Romans; and the Greek fiction was a still worse expedient, inasmuch as under it the gods only bestowed on the grandson what they had adjudged to the grandsire.
But the redaction served its object: without exactly denying the national origin of Rome, it yet deferred to the Hellenizing tendency, and legalized in some degree that desire to claim kindred with Aeneas and his descendants which was already at this epoch greatly in vogue;(60) and thus it became the stereotyped, and was soon accepted as the official, account of the origin of the mighty community.
60. Cf. III. XIV. Knowledge of Languages
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Reference address : https://www.ellopos.net/elpenor/rome/3-14-literature-art.asp?pg=91