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
Regulations As to the Burgesses
In respect to legislation Sulla contented himself with reviving the regulations made in 666, and securing to the senate the legislative initiative, which had long belonged to it practically, by legal enactment at least as against the tribunes. The burgess-body remained formally sovereign; but so far as its primary assemblies were concerned, while it seemed to the regent necessary carefully to preserve the form, he was still more careful to prevent any real activity on their part.
Sulla dealt even with the franchise itself in the most contemptuous manner; he made no difficulty either in conceding it to the new burgess-communities, or in bestowing it on Spaniards and Celts en masse; in fact, probably not without design, no steps were taken at all for the adjustment of the burgess-roll, which nevertheless after so violent revolutions stood in urgent need of a revision, if the government was still at all in earnest with the legal privileges attaching to it.
The legislative functions of the comitia, however, were not directly restricted; there was no need in fact for doing so, for in consequence of the better- secured initiative of the senate the people could not readily against the will of the government intermeddle with administration, finance, or criminal jurisdiction, and its legislative co-operation was once more reduced in substance to the right of giving assent to alterations of the constitution.
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Reference address : https://www.ellopos.net/elpenor/rome/4-10-sullan-constitution.asp?pg=26