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
Yet they might, perhaps, have got over this, and after the manner of oligarchs, when they had no capable candidate, have filled the place with some sort of makeshift, if Pompeius had merely desired the command and had not demanded it at the head of an army. He had already lent a deaf ear to the injunctions of Catulus that he should dismiss the army; it was at least doubtful whether those of the senate would find a better reception, and the consequences of a breach no one could calculate-- the scale of aristocracy might very easily mount up, if the sword of a well-known general were thrown into the opposite scale.
So the majority resolved on concession. Not from the people, which constitutionally ought to have been consulted in a case where a private man was to be invested with the supreme magisterial power, but from the senate, Pompeius received proconsular authority and the chief command in Hither Spain; and, forty days after he had received it, crossed the Alps in the summer of 677.
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Reference address : https://www.ellopos.net/elpenor/rome/5-01-lepidus-sertorius.asp?pg=40