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
Bestowal of the Franchise on the Italians Who Remained Faithful-- or Submitted
Of greater importance than this singularly candid political recantation, was the change in the course of their policy toward the Italians. Exactly three hundred years had passed since Rome had last been obliged to submit to the dictation of peace; Rome was now worsted once more, and the peace which she desired could only be got by yielding in part at least to the terms of her antagonists.
With the communities, doubtless, which had already risen in arms to subdue and to destroy Rome, the feud had become too bitter for the Romans to prevail on themselves to make the required concessions; and, had they done so, these terms would now perhaps have been rejected by the other side. But, if the original demands were conceded under certain limitations to the communities that had hitherto remained faithful, such a course would on the one hand preserve the semblance of voluntary concession, while on the other hand it would prevent the otherwise inevitable consolidation of the confederacy and thereby pave the way for its subjugation.
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Reference address : https://www.ellopos.net/elpenor/rome/4-07-sulpician-revolution.asp?pg=37