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
Value of the Sullan Constitution
But the whole country--and not the aristocracy merely--was more indebted to him than posterity was willing to confess. Sulla definitely terminated the Italian revolution, in so far as it was based on the disabilities of individual less privileged districts as compared with others of better rights, and, by compelling himself and his party to recognize the equality of the rights of all Italians in presence of the law, he became the real and final author of the full political unity of Italy--a gain which was not too dearly purchased by ever so many troubles and streams of blood. Sulla however did more.
For more than half a century the power of Rome had been declining, and anarchy had been her permanent condition: for the government of the senate with the Gracchan constitution was anarchy, and the government of Cinna and Carbo was a yet far worse illustration of the absence of a master- hand (the sad image of which is most clearly reflected in that equally confused and unnatural league with the Samnites), the most uncertain, most intolerable, and most mischievous of all conceivable political conditions--in fact the beginning of the end.
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Reference address : https://www.ellopos.net/elpenor/rome/4-10-sullan-constitution.asp?pg=70