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
This enlargement of the historical horizon by the expeditions of Caesar beyond the Alps was as significant an event in the world's history as the exploring of America by European bands. To the narrow circle of the Mediterranean states were added the peoples of central and northern Europe, the dwellers on the Baltic and North seas; to the old world was added a new one, which thenceforth was influenced by the old and influenced it in turn. What the Gothic Theodoric afterwards succeeded in, came very near to being already carried out by Ariovistus. Had it so happened, our civilization would have hardly stood in any more intimate relation to the Romano-Greek than to the Indian and Assyrian culture.
That there is a bridge connecting the past glory of Greece and Rome with the prouder fabric of modern history; that Western Europe is Romanic, and Germanic Europe classic; that the names of Themistocles and Scipio have to us a very different sound from those of Asoka and Salmanassar; that Homer and Sophocles are not merely like the Vedas and Kalidasa attractive to the literary botanist, but bloom for us in our own garden--all this is the work of Caesar; and, while the creation of his great predecessor in the east has been almost wholly reduced to ruin by the tempests of the Middle Ages, the structure of Caesar has outlasted those thousands of years which have changed religion and polity for the human race and even shifted for it the centre of civilization itself, and it stands erect for what we may designate as eternity.
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Reference address : https://www.ellopos.net/elpenor/rome/5-07-subjugation-west.asp?pg=142