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
Legislation of Sulla
With a view to remove existing evils and to prevent future revolutions, Sulla suggested a series of new legislative enactments. For the hard-pressed debtors nothing seems to have been done, except that the rules as to the maximum of interest were enforced;(24) directions moreover were given for the sending out of a number of colonies.
24. It is not clear, what the -lex unciaria- of the consuls Sulla and Rufus in the year 666 prescribed in this respect; but the simplest hypothesis is that which regards it as a renewal of the law of 397 (i. 364), so that the highest allowable rate of interest was again 1 1/12th of the capital for the year of ten months or 10 per cent for the year of twelve months.
The senate which had been greatly thinned by the battles and prosecutions of the Social war was filled up by the admission of 300 new senators, who were naturally selected in the interest of the Optimates. Lastly, material changes were adopted in respect to the mode of election and the initiative of legislation.
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Reference address : https://www.ellopos.net/elpenor/rome/4-07-sulpician-revolution.asp?pg=73