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
Outbreak of the Cinnan Revolution - Victory of the Government
So long as Sulla was in Italy, the confederates for good reasons remained quiet. But when the dreaded proconsul, yielding not to the exhortations of the consul Cinna but to the urgent state of matters in the east, had embarked, Cinna, supported by the majority of the college of tribunes, immediately submitted the projects of law which had been concerted as a partial reaction against the Sullan restoration of 666. They embraced the political equalization of the new burgesses and the freedmen, as Sulpicius had proposed it, and the restitution of those who had been banished in consequence of the Sulpician revolution to their former status.
The new burgesses flocked en masse to the capital, that along with the freedmen they might terrify, and in case of need force, their opponents into compliance. But the government party was determined not to yield, consul stood against consul, Gnaeus Octavius against Lucius Cinna, and tribune against tribune; both sides appeared in great part armed on the day and at the place of voting. The tribunes of the senatorial party interposed their veto; when swords were drawn against them even on the rostra, Octavius employed force against force.
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Reference address : https://www.ellopos.net/elpenor/rome/4-09-cinna-sulla.asp?pg=5