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 temper of the burgesses became daily more depressed and troublesome. On the proclamation of the heralds of Cinna guaranteeing freedom to the slaves who should desert, these flocked in troops from the capital to the enemy's camp. But the proposal that the senate should guarantee freedom to the slaves willing to enter the army was decidedly resisted by Octavius. The government could not conceal from itself that it was defeated, and that nothing remained but to come to terms if possible with the leaders of the band, as the overpowered traveller comes to terms with the captain of banditti.
Envoys went to Cinna; but, while they foolishly made difficulties as to recognizing him as consul, and Cinna in the interval thus prolonged transferred his camp close to the city-gates, the desertion spread to so great an extent that it was no longer possible to settle any terms. The senate submitted itself unconditionally to the outlawed consul, adding only a request that he would refrain from bloodshed, Cinna promised this, but refused to ratify his promise by an oath; Marius, who kept by his side during the negotiations, maintained a sullen silence.
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Reference address : https://www.ellopos.net/elpenor/rome/4-09-cinna-sulla.asp?pg=15