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
In the other non-Greek and non-Latin regions of the empire, which were still more remote from the influence of Italy and the process of assimilation, Caesar confined himself to the establishment of several centres for Italian civilization such as Narbo had hitherto been in Gaul, in order by their means to pave the way for a future complete equalization. Such initial steps can be pointed out in all the provinces of the empire, with the exception of the poorest and least important of all, Sardinia. How Caesar proceeded in Northern Gaul, we have already set forth;(95) the Latin language there obtained throughout official recognition, though not yet employed for all branches of public intercourse, and the colony of Noviodunum (Nyon) arose on the Leman lake as the most northerly town with an Italian constitution.
95. Cf. V. VII. Indulgence toward Existing Arrangements
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Reference address : https://www.ellopos.net/elpenor/rome/5-11-old-republic-new-monarchy.asp?pg=157