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
Personal Government by Caesar
While the rule of the nobility was thus set aside and its existence undermined, and while the senate in its new form was merely a tool of the monarch, autocracy was at the same time most strictly carried out in the administration and government of the state, and the whole executive was concentrated in the hands of the monarch. First of all, the Imperator naturally decided in person every question of any moment. Caesar was able to carry personal government to an extent which we puny men can hardly conceive, and which is not to be explained solely from the unparalleled rapidity and decision of his working, but has moreover its ground in a more general cause.
When we see Caesar, Sulla, Gaius Gracchus, and Roman statesmen in general displaying throughout an activity which transcends our notions of human powers of working, the reason lies, not in any change that human nature has undergone since that time, but in the change which has taken place since then in the organization of the household. The Roman house was a machine, in which even the mental powers of the slaves and freedmen yielded their produce to the master; a master, who knew how to govern these, worked as it were with countless minds.
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Reference address : https://www.ellopos.net/elpenor/rome/5-11-old-republic-new-monarchy.asp?pg=48