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
On the proposal of the tribune Quintus Varius, in spite of the resistance of the Optimates and in spite of tribunician interference, a special commission of high treason--formed, of course, from the equestrian order which contended for the proposal with open violence--was appointed for the investigation of the conspiracy instigated by Drusus and widely ramified in Italy as well as in Rome, out of which the insurrection had originated, and which now, when the half of Italy was under arms, appeared to the whole of the indignant and alarmed burgesses as undoubted treason.
The sentences of this commission largely thinned the ranks of the senatorial party favourable to mediation: among other men of note Drusus' intimate friend, the young and talented Gaius Cotta, was sent into banishment, and with difficulty the grey-haired Marcus Scaurus escaped the same fate. Suspicion went so far against the senators favourable to the reforms of Drusus, that soon afterwards the consul Lupus reported from the camp to the senate regarding the communications that were constantly maintained between the Optimates in his camp and the enemy; a suspicion which, it is true, was soon shown to be unfounded by the arrestof Marsian spies. So far king Mithradates might not without reason assert, that the mutual enmities of the factions were more destructive to the Roman state than the Social War itself.
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Reference address : https://www.ellopos.net/elpenor/rome/4-07-sulpician-revolution.asp?pg=20