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
Sulla had not sought and had not desired the difficult and dreadful labour of the work of restoration; out, as no other choice was left to him but either to leave it to utterly incapable hands or to undertake it in person, he set himself to it with remorseless energy. First of all a settlement had to be effected in respect to the guilty. Sulla was personally inclined to pardon. Sanguine as he was in temperament, he could doubtless break forth into violent rage, and well might those beware who saw his eye gleam and his cheeks colour; but the chronic vindictiveness, which characterized Marius in the embitterment of his old age, was altogether foreign to Sulla's easy disposition.
Not only had he borne himself with comparatively great moderation after the revolution of 666;(4) even the second revolution, which had perpetrated so fearful outrages and had affected him in person so severely, had not disturbed his equilibrium.
4. Cf. IV. VII. Legislation of Sulla
At the same time that the executioner was dragging the bodies of his friends through the streets of the capital, he had sought to save the life of the blood-stained Fimbria, and, when the latter died by his own hand, had given orders for his decent burial. On landing in Italy he had earnestly offered to forgive and to forget, and no one who came to make his peace had been rejected.
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Reference address : https://www.ellopos.net/elpenor/rome/4-10-sullan-constitution.asp?pg=6