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
His compact bands of armed men not only cleared the Via Sacra and the Forum, but also, disregarding the commands of their more gentle-minded leader, exercised horrible atrocities against the assembled multitude. The Forum swam with blood on this "Octavius' day," as it never did before or afterwards--the number of corpses was estimated at ten thousand. Cinna called on the slaves to purchase freedom for themselves by sharing in the struggle; but his appeal was as unsuccessful as the like appeal of Marius in the previous year, and no course was left to the leaders of the movement but to take flight.
The constitution supplied no means of proceeding farther against the chiefs of the conspiracy, so long as their year of office lasted. But a prophet presumably more loyal than pious had announced that the banishment of the consul Cinna and of the six tribunes of the people adhering to him would restore peace and tranquillity to the country; and, in conformity not with the constitution but with this counsel of the gods fortunately laid hold of by the custodiers of oracles, the consul Cinna was by decree of the senate deprived of his office, Lucius Cornelius Merula was chosen in his stead, and outlawry was pronounced against the chiefs who had fled. It seemed as if the whole crisis were about to end in a few additions to the number of the men who were exiles in Numidia.
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Reference address : https://www.ellopos.net/elpenor/rome/4-09-cinna-sulla.asp?pg=6