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
Next year (656) a law brought in by the two consuls made the usual four-and-twenty days' interval between the introduction and the passing of a project of law obligatory, and forbade the combination of several enactments different in their nature in one proposal; by which means the unreasonable extension of the initiative in legislation was at least somewhat restricted, and the government was prevented from being openly taken by surprise with new laws.
It became daily more evident that the Gracchan constitution, which had survived the fall of its author, was now, since the multitude and the moneyed aristocracy no longer went together, tottering to its foundations. As that constitution had been based on division in the ranks of the aristocracy, so it seemed that dissensions in the ranks of the opposition could not but bring about its fall.
Now, if ever, the time had come for completing the unfinished work of restoration of 633, for making the Gracchan constitution share the fate of the tyrant, and for replacing the governing oligarchy in the sole possession of political power.
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Reference address : https://www.ellopos.net/elpenor/rome/4-06-marius-revolution-drusus-reform.asp?pg=38