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
Thus the republican opposition, after having been for years obliged to rest content with the part of a mere spectator and having hardly ventured to whisper, was now brought back once more to the political stage by the impending rupture between the regents. It consisted primarily of the circle which rallied round Cato-- those republicans who were resolved to venture on the struggle for the republic and against the monarchy under all circumstances, and the sooner the better. The pitiful issue of the attempt made in 698(15) had taught them that they by themselves alone were not in a position either to conduct war or even to call it forth; it was known to every one that even in the senate, while the whole corporation with a few isolated exceptions was averse to monarchy, the majority would still only restore the oligarchic government if it might be restored without danger--in which case, doubtless, it had a good while to wait. In presence of the regents on the one hand, and on the other hand of this indolent majority, which desired peace above all things and at any price, and was averse to any decided action and most of all to a decided rupture with one or other of the regents, the only possible course for the Catonian party to obtain a restoration of the old rule lay in a coalition with the less dangerous of the rulers.
15. Cf. V. VIII. The Aristocracy Submits ff.
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Reference address : https://www.ellopos.net/elpenor/rome/5-09-crassus-joint-rulers.asp?pg=28