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
Rupture between Pompeius and the Aristocracy
Such was the state of parties amidst which the emissary sent by Pompeius appeared. The aristocracy not only regarded the proposals which he announced in favour of Pompeius as a declaration of war against the existing constitution, but treated them openly as such, and took not the slightest pains to conceal their alarm and their indignation. With the express design of combating these proposals, Marcus Cato had himself elected as tribune of the people along with Nepos, and abruptly repelled the repeated attempts of Pompeius to approach him personally.
Nepos naturally after this found himself under no inducement to spare the aristocracy, but attached himself the more readily to the democrats, when these, pliant as ever, submitted to what was inevitable and chose freely to concede the office of general in Italy as well as the consulate rather than let the concession be wrung from them by force of arms.
The cordial understanding soon showed itself. Nepos publicly accepted (Dec. 691) the democratic view of the executions recently decreed by the majority of the senate, as unconstitutional judicial murders; and that his lord and master looked on them in no other light, was shown by his significant silence respecting the voluminous vindication of them which Cicero had sent to him.
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Reference address : https://www.ellopos.net/elpenor/rome/5-06-pompeius-coalition-pretenders.asp?pg=6