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
He saved and renewed the Roman type; and not only did he spare the Greek type, but with the same self-relying genius with which he accomplished the renewed foundation of Rome he undertook also the regeneration of the Greeks, and resumed the interrupted work of the great Alexander, whose image, we may well believe, never was absent from Caesar's soul. He solved these two great tasks not merely side by side, but the one by means of the other. The two great essentials of humanity--general and individual development, or state and culture-- once in embryo united in those old Graeco-Italians feeding their flocks in primeval simplicity far from the coasts and islands of the Mediterranean, had become dissevered when these were parted into Italians and Greeks, and had thenceforth remained apart for many centuries. Now the descendant of the Trojan prince and the Latin king's daughter created out of a state without distinctive culture and a cosmopolitan civilization a new whole, in which state and culture again met together at the acme of human existence in the rich fulness of blessed maturity and worthily filled the sphere appropriate to such an union.
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Reference address : https://www.ellopos.net/elpenor/rome/5-11-old-republic-new-monarchy.asp?pg=180