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
Even callous hearts were impressed, when the man who had hitherto dealt at his pleasure with the life and property of millions, at whose nod so many heads had fallen, who had mortal enemies dwelling in every street of Rome and in every town of Italy, and who without an ally of equal standing and even, strictly speaking, without the support of a fixed party had brought to an end his work of reorganizing the state, a work offending a thousand interests and opinions--when this man appeared in the market-place of the capital, voluntarily renounced his plenitude of power, discharged his armed attendants, dismissed his lictors, and summoned the dense throng of burgesses to speak, if any one desired from him a reckoning.
All were silent: Sulla descended from the rostra, and on foot, attended only by his friends, returned to his dwelling through the midst of that very populace which eight years before had razed his house to the ground.
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Reference address : https://www.ellopos.net/elpenor/rome/4-10-sullan-constitution.asp?pg=60