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
Ferment in Rome - The Bestowal of the Franchise and Its Limitations - Secondary Effect of the Political Prosecutions - Marius
Rome was in a fearful ferment. The attack of Drusus upon the equestrian courts and his sudden downfall brought about by the equestrian party, followed by the two-edged Varian warfare of prosecutions, had sown the bitterest discord between the aristocracy and the bourgeoisie as well as between the moderates and the ultras. Events had completely justified the party of concession; what it had proposed voluntarily to bestow, men had been more than half compelled to concede; but the mode in which the concession was made bore, just like the earlier refusal, the stamp of obstinate and shortsighted envy.
Instead of granting equality of rights to all Italian communities, they had only expressed the inferiority in another form. They had received a great number of Italian communities into Roman citizenship, but had attached to what they thus conferred an offensive stigma, by placing the new burgesses alongside of the old on nearly the same footing as the freedmen occupied alongside of the freeborn. They had irritated rather than pacified the communities between the Po and the Alps by the concession of Latin rights.
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Reference address : https://www.ellopos.net/elpenor/rome/4-07-sulpician-revolution.asp?pg=52