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
There was, further, the remnant of the old liberal minority in the senate, which in former times had laboured to effect a compromise with the reform party and the Italians, and was now in a similar spirit inclined to modify the rigidly oligarchic constitution of Sulla by concessions to the Populares. There were, moreover, the Populares strictly so called, the honestly credulous narrow-minded radicals, who staked property and life for the current watchwords of the party-programme, only to discover with painful surprise after the victory that they had been fighting not for a reality, but for a phrase.
Their special aim was to re-establish the tribunician power, which Sulla had not abolished but had divested of its most essential prerogatives, and which exercised over the multitude a charm all the more mysterious, because the institution had no obvious practical use and was in fact an empty phantom--the mere name of tribune of the people, more than a thousand years later, revolutionized Rome.
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Reference address : https://www.ellopos.net/elpenor/rome/5-01-lepidus-sertorius.asp?pg=2