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
As a matter of course the membership of the college of augurs was conferred on him, and generally an abundance of old and new honorary rights, such as the title of a "father of the fatherland," the designation of the month of his birth by the name which it still bears of Julius, and other manifestations of the incipient courtly tone which ultimately ran into utter deification. Two only of the arrangements deserve to be singled out: namely that Caesar was placed on the same footing with the tribunes of the people as regards their special personal inviolability, and that the appellation of Imperator was permanently attached to his person and borne by him as a title alongside of his other official designations.
Men of judgment will not require any proof, either that Caesar intended to engraft on the commonwealth his supreme power, and this not merely for a few years or even as a personal office for an indefinite period somewhat like Sulla's regency, but as an essential and permanent organ; or that he selected for the new institution an appropriate and simple designation; for, if it is a political blunder to create names without substantial meaning, it is scarcely a less error to set up the substance of plenary power without a name. Only it is not easy to determine what definitive formal shape Caesar had in view; partly because in this period of transition the ephemeral and the permanent buildings are not clearly discriminated from each other, partly because the devotion of his clients which already anticipated the nod of their master loaded him with a multitude--offensive doubtless to himself--of decrees of confidence and laws conferring honours.
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Reference address : https://www.ellopos.net/elpenor/rome/5-11-old-republic-new-monarchy.asp?pg=33