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 the person who really completed the conception subsequently current of this Trojan migration was Timaeus of Tauromenium in Sicily, who concluded his historical work with 492. It is he who represents Aeneas as first founding Lavinium with its shrine of the Trojan Penates, and as thereafter founding Rome; he must also have interwoven the Tyrian princess Elisa or Dido with the legend of Aeneas, for with him Dido is the foundress of Carthage, and Rome and Carthage are said by him to have been built in the same year.
These alterations were manifestly suggested by certain accounts that had reached Sicily respecting Latin manners and customs, in conjunction with the critical struggle which at the very time and place where Timaeus wrote was preparing between the Romans and the Carthaginians. In the main, however, the story cannot have been derived from Latium, but can only have been the good-for-nothing invention of the old "gossip-monger" himself.
Timaeus had heard of the primitive temple of the household gods in Lavinium; but the statement, that these were regarded by the Lavinates as the Penates brought by the followers of Aeneas from Ilion, is as certainly an addition of his own, as the ingenious parallel between the Roman October horse and the Trojan horse, and the exact inventory taken of the sacred objects of Lavinium--there were, our worthy author affirms, heralds' staves of iron and copper, and an earthen vase of Trojan manufacture!
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Reference address : https://www.ellopos.net/elpenor/rome/2-09-art-science.asp?pg=22