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 the authority of the Imperator was qualitatively superior to the consular-proconsular, in so far as the former was not limited as respected time or space, but was held for life and operative also in the capital;(16) as the Imperator could not, while the consul could, be checked by colleagues of equal power; and as all the restrictions placed in course of time on the original supreme official power-- especially the obligation to give place to the -provocatio- and to respect the advice of the senate--did not apply to the Imperator.
16. When Augustus in constituting the principate resumed the Caesarian imperium, this was done with the restriction that it should be limited as to space and in a certain sense also as to time; the proconsular power of the emperors, which was nothing but just this imperium, was not to come into application as regards Rome and Italy (Staatsrecht, ii. 8 854). On this element rests the essential distinction between the Caesarian imperium and the Augustan principate, just as on the other hand the real equality of the two institutions rests on the imperfection with which even in principle and still more in practice that limit was realized.
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Reference address : https://www.ellopos.net/elpenor/rome/5-11-old-republic-new-monarchy.asp?pg=37