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
He had connections enough in the capital and the country towns to have a chance alongside of the candidates proposed by the democracy; and as the nobility, although with reluctance, and the Pompeians voted for him, he was elected by a great majority. The two candidates of the democracy obtained almost the same number of votes; but a few more fell to Antonius, whose family was of more consideration than that of his fellow-candidate. This accident frustrated the election of Catilina and saved Rome from a second Cinna. A little before this Piso had--it was said at the instigation of his political and personal enemy Pompeius-- been put to death in Spain by his native escort.(15)
15. His epitaph still extant runs: -Cn. Calpurnius Cn. f. Piso quaestor fro pr. ex s. c. proviniciam Hispaniam citeriorem optinuit-.
With the consul Antonius alone nothing could be done; Cicero broke the loose bond which attached him to the conspiracy, even before they entered on their offices, inasmuch as he renounced his legal privilege of having the consular provinces determined by lot, and handed over to his deeply-embarrassed colleague the lucrative governorship of Macedonia. The essential preliminary conditions of this project also had therefore miscarried.
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Reference address : https://www.ellopos.net/elpenor/rome/5-05-parties-pompeius.asp?pg=23