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, while the Etruscans differed thus widely from the Graeco-Italian family of languages, no one has yet succeeded in connecting them with any other known race. All sorts of dialects have been examined with a view to discover affinity with the Etruscan, sometimes by simple interrogation, sometimes by torture, but all without exception in vain. The geographical position of the Basque nation would naturally suggest it for comparison; but even in the Basque language no analogies of a decisive character have been brought forward. As little do the scanty remains of the Ligurian language which have reached our time, consisting of local and personal names, indicate any connection with the Tuscans.
Even the extinct nation which has constructed those enigmatical sepulchral towers, called -Nuraghe-, by thousands in the islands of the Tuscan Sea, especially in Sardinia, cannot well be connected with the Etruscans, for not a single structure of the same character is to be met with in Etruscan territory. The utmost we can say is that several traces, that seem tolerably trustworthy, point to the conclusion that the Etruscans may be on the whole numbered with the Indo-Germans.
Thus -mi- in the beginning of many of the older inscriptions is certainly ἐμι, εἰμι, and the genitive form of consonantal stems veneruf -rafuvuf- is exactly reproduced in old Latin, corresponding to the old Sanscrit termination -as. In like manner the name of the Etruscan Zeus, -Tina-or -Tinia-, is probably connected with the Sanscrit -dina-, meaning day, as Ζᾶν is connected with the synonymous -diwan-. But, even granting this, the Etruscan people appears withal scarcely less isolated "The Etruscans," Dionysius said long ago, "are like no other nation in language and manners;" and we have nothing to add to his statement.
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Reference address : https://www.ellopos.net/elpenor/rome/1-09-etruscans.asp?pg=5