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 guilt of those arrested as well as of the fugitives was completely evident. Immediately after the arrest the letters seized, the seals and handwriting of which the prisoners could not avoid acknowledging, were laid before the senate, and the captives and witnesses were heard; further confirmatory facts, deposits of arms in the houses of the conspirators, threatening expressions which they had employed, were presently forthcoming; the actual subsistence of the conspiracy was fully and validly established, and the most important documents were immediately on the suggestion of Cicero published as news-sheets.
The indignation against the anarchist conspiracy was general. Gladly would the oligarchic party have made use of the revelations to settle accounts with the democracy generally and Caesar in particular, but it was far too thoroughly broken to be able to accomplish this, and to prepare for him the fate which it had formerly prepared for the two Gracchi and Saturninus; in this respect the matter went no farther than good will. The multitude of the capital was especially shocked by the incendiary schemes of the conspirators. The merchants and the whole party of material interests naturally perceived in this war of the debtors against the creditors a struggle for their very existence; in tumultuous excitement their youth crowded, with swords in their hands, round the senate-house and brandished them against the open and secret partisans of Catilina. In fact, the conspiracy was for the moment paralyzed; though its ultimate authors perhaps were still at liberty, the whole staff entrusted with its execution were either captured or had fled; the band assembled at Faesulae could not possibly accomplish much, unless supported by an insurrection in the capital.
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Reference address : https://www.ellopos.net/elpenor/rome/5-05-parties-pompeius.asp?pg=36