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
Indignation of the Anarchist Party against Caesar - The Republican Party in Italy
But at the moment this moderation was more dangerous for Caesar than the renewal of the Cinnan and Catilinarian fury would have been; it did not convert enemies into friends, and it converted friends into enemies. Caesar's Catilinarian adherents were indignant that murder and pillage remained in abeyance; these audacious and desperate personages, some of whom were men of talent, might be expected to prove cross and untractable. The republicans of all shades, on the other hand, were neither converted nor propitiated by the leniency of the conqueror.
According to the creed of the Catonian party, duty towards what they called their fatherland absolved them from every other consideration; even one who owed freedom and life to Caesar remained entitled and in duty bound to take up arms or at least to engage in plots against him. The less decided sections of the constitutional party were no doubt found willing to accept peace and protection from the new monarch; nevertheless they ceased not to curse the monarchy and the monarch at heart. The more clearly the change of the constitution became manifest, the more distinctly the great majority of the burgesses--both in the capital with its keener susceptibility of political excitement, and among the more energetic population of the country and country towns-- awoke to a consciousness of their republican sentiments; so far the friends of the constitution in Rome reported with truth to their brethren of kindred views in exile, that at home all classes and all persons were friendly to Pompeius.
The discontented temper of all these circles was further increased by the moral pressure, which the more decided and more notable men who shared such views exercised from their very position as emigrants over the multitude of the humbler and more lukewarm. The conscience of the honourable man smote him in regard to his remaining in Italy; the half-aristocrat fancied that he was ranked among the plebeians, if he did not go into exile with the Domitii and the Metelli, and even if he took his seat in the Caesarian senate of nobodies. The victor's special clemency gave to this silent opposition increased political importance; seeing that Caesar abstained from terrorism, it seemed as if his secret opponents could display their disinclination to his rule without much danger.
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Reference address : https://www.ellopos.net/elpenor/rome/5-10-brundisium-pharsalus-thapsus.asp?pg=31