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
Conviction and Arrest of the Conspirators in the Capital
At length the countermine brought about a decision. Lentulus in his tedious fashion, which sought to cover negligence in regard to what was immediate and necessary by the projection of large and distant plans, had entered into relations with the deputies of a Celtic canton, the Allobroges, now present in Rome; had attempted to implicate these--the representatives of a thoroughly disorganized commonwealth and themselves deeply involved in debt--in the conspiracy; and had given them on their departure messages and letters to his confidants. The Allobroges left Rome, but were arrested in the night between 2nd and 3rd Dec. close to the gates by the Roman authorities, and their papers were taken from them.
It was obvious that the Allobrogian deputies had lent themselves as spies to the Roman government, and had carried on the negotiations only with a view to convey into the hands of the latter the desired proofs implicating the ringleaders of the conspiracy. On the following morning orders were issued with the utmost secrecy by Cicero for the arrest of the most dangerous leaders of the plot, and executed in regard to Lentulus, Cethegus, Gabinius, and Statilius, while some others escaped from seizure by flight.
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Reference address : https://www.ellopos.net/elpenor/rome/5-05-parties-pompeius.asp?pg=35