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
Organization of the New Empire
While thus the new united empire was furnished with a national character, which doubtless necessarily lacked individuality and was rather an inanimate product of art than a fresh growth of nature, it further had need of unity in those institutions which express the general life of nations--in constitution and administration, in religion and jurisprudence, in money, measures, and weights; as to which, of course, local diversities of the most varied character were quite compatible with essential union. In all these departments we can only speak of the initial steps, for the thorough formation of the monarchy of Caesar into an unity was the work of the future, and all that he did was to lay the foundation for the building of centuries. But of the lines, which the great man drew in these departments, several can still be recognized; and it is more pleasing to follow him here, than in the task of building from the ruins of the nationalities.
Census of the Empire
As to constitution and administration, we have already noticed elsewhere the most important elements of the new unity-- the transition of the sovereignty from the municipal council of Rome to the sole master of the Mediterranean monarchy; the conversion of that municipal council into a supreme imperial council representing Italy and the provinces; above all, the transference--now commenced-- of the Roman, and generally of the Italian, municipal organization to the provincial communities. This latter course--the bestowal of Latin, and thereafter of Roman, rights on the communities ripe for full admission to the united state--gradually of itself brought about uniform communal arrangements. In one respect alone this process could not be waited for.
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Reference address : https://www.ellopos.net/elpenor/rome/5-11-old-republic-new-monarchy.asp?pg=165