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
The republican opposition submitted to be pardoned; but it was not reconciled. Discontent with the new order of things and exasperation against the unwonted ruler were general. For open political resistance there was indeed no farther opportunity-- it was hardly worth taking into account, that some oppositional tribunes on occasion of the question of title acquired for themselves the republican crown of martyrdom by a demonstrative intervention against those who had called Caesar king--but republicanism found expression all the more decidedly as an opposition of sentiment, and in secret agitation and plotting. Not a hand stirred when the Imperator appeared in public.
There was abundance of wall-placards and sarcastic verses full of bitter and telling popular satire against the new monarchy. When a comedian ventured on a republican allusion, he was saluted with the loudest applause. The praise of Cato formed the fashionable theme of oppositional pamphleteers, and their writings found a public all the more grateful because even literature was no longer free. Caesar indeed combated the republicans even now on their own field; he himself and his abler confidants replied to the Cato-literature with Anticatones, and the republican and Caesarian scribes fought round the dead hero of Utica like the Trojans and Greeks round the dead body of Patroclus; but as a matter of course in this conflict--where the public thoroughly republican in its feelings was judge--the Caesarians had the worst of it.
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Reference address : https://www.ellopos.net/elpenor/rome/5-11-old-republic-new-monarchy.asp?pg=21