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
But the projects of Catilina failed; chiefly because the agents of the government had made their way into the circle of the conspirators and kept it accurately informed of every detail of the plot. When, for instance, the conspirators appeared before the strong Praeneste (1 Nov.), which they had hoped to surprise by a -coup de main-, they found the inhabitants warned and armed; and in a similar way everything miscarried.
Catilina with all his temerity now found it advisable to fix his departure for one of the ensuing days; but previously on his urgent exhortation, at a last conference of the conspirators in the night between the 6th and 7th Nov. it was resolved to assassinate the consul Cicero, who was the principal director of the countermine, before the departure of their leader, and, in order to obviate any treachery, to carry the resolve at once into execution.
Early on the morning of the 7th Nov., accordingly, the selected murderers knocked at the house of the consul; but they found the guard reinforced and themselves repulsed--on this occasion too the spies of the government had outdone the conspirators.
Do you see any typos or other mistakes? Please let us know and correct them
Reference address : https://www.ellopos.net/elpenor/rome/5-05-parties-pompeius.asp?pg=33