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
The capitalist party might have furnished a support, but it was injured in the most sensitive point by the law as to debt. The true mainstay of the government was--wholly without any cooperation on its part--the new burgesses; their assistance was acquiesced in, but nothing was done to regulate the strange position of the Samnites, who were now nominally Roman citizens, but evidently regarded their country's independence as practically the real object and prize of the struggle and remained in arms to defend it against all and sundry.
Illustrious senators were struck down like mad dogs; but not the smallest step was taken to reorganize the senate in the interest of the government, or even permanently to terrify it; so that the government was by no means sure of its aid. Gaius Gracchus had not understood the fall of the oligarchy as implying that the new master might conduct himself on his self-created throne, as legitimate cipher-kings think proper to do. But this Cinna had been elevated to power not by his will, but by pure accident; was there any wonder that he remained where the storm-wave of revolution had washed him up, till a second wave came to sweep him away again?
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Reference address : https://www.ellopos.net/elpenor/rome/4-09-cinna-sulla.asp?pg=23