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
Election of Catalina as Consul again Frustrated
Cicero, who was always quickly and completely informed by his agents male and female of the transactions of the conspirators, on the day fixed for the election (20 Oct.) denounced the conspiracy in the full senate and in presence of its principal leaders. Catilina did not condescend to deny it; he answered haughtily that, if the election for consul should fall on him, the great headless party would certainly no longer want a leader against the small party led by wretched heads. But as palpable evidences of the plot were not before them, nothing farther was to be got from the timid senate, except that it gave its previous sanction in the usual way to the exceptional measures which the magistrates might deem suitable (21 Oct.).
Thus the election battle approached-- on this occasion more a battle than an election; for Cicero too had formed for himself an armed bodyguard out of the younger men, more especially of the mercantile order; and it was his armed force that covered and dominated the Campus Martius on the 28th October, the day to which the election had been postponed by the senate. The conspirators were not successful either in killing the consul conducting the election, or in deciding the elections according to their mind.
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Reference address : https://www.ellopos.net/elpenor/rome/5-05-parties-pompeius.asp?pg=29