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
Thereupon the day of voting arrived. The multitude stood densely packed in the Forum; all the buildings, whence the rostra could be seen, were covered up to the roofs with men. All the colleagues of Gabinius had promised their veto to the senate; but in presence of the surging masses all were silent except the single Lucius Trebellius, who had sworn to himself and the senate rather to die than yield. When the latter exercised his veto, Gabinius immediately interrupted the voting on his projects of law and proposed to the assembled people to deal with his refractory colleague, as Octavius had formerly been dealt with on the proposition of Tiberius Gracchus,(13) namely, to depose him immediately from office.
13. Cf. IV. II. Further Plans of Gracchus
The vote was taken and the reading out of the voting tablets began; when the first seventeen tribes, which came to be read out, had declared for the proposal and the next affirmative vote would give to it the majority, Trebellius, forgetting his oath, pusillanimously withdrew his veto. In vain the tribune Otho then endeavoured to procure that at least the collegiate principle might be preserved, and two generals elected instead of one; in vain the aged Quintus Catulus, the most respected man in the senate, exerted his last energies to secure that the lieutenant-generals should not be nominated by the commander-in-chief, but chosen by the people. Otho could not even procure a hearing amidst the noise of the multitude; the well-calculated complaisance of Gabinius procured a hearing for Catulus, and in respectful silence the multitude listened to the old man's words; but they were none the less thrown away. The proposals were not merely converted into law with all the clauses unaltered, but the supplementary requests in detail made by Pompeius were instantaneously and completely agreed to.
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Reference address : https://www.ellopos.net/elpenor/rome/5-03-fall-oligarchy-pompeius.asp?pg=33