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
Ascendency of the Government - Marius Politically Annihilated
Never had the government party achieved a more complete victory, never had the opposition suffered a more severe defeat, than on this 10th of December. It was the least part of the success that they had got rid of some troublesome brawlers, whose places might be supplied any day by associates of a like stamp; it was of greater moment that the only man, who was then in a position to become dangerous to the government, had publicly and completely effected his own annihilation; and most important of all that the two elements of the opposition, the capitalist order and the proletariate, emerged from the strife wholly at variance.
It is true that this was not the work of the government; the fabric which had been put together by the adroit hands of Gaius Gracchus had been broken up, partly by the force of circumstances, partly and especially by the coarse and boorish management of his incapable successor; but in the result it mattered not whether calculation or good fortune helped the government to its victory. A more pitiful position can hardly be conceived than that occupied by the hero of Aquae and Vercellae after such a disaster--all the more pitiful, because people could not but compare it with the lustre which only a few months before surrounded the same man.
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Reference address : https://www.ellopos.net/elpenor/rome/4-06-marius-revolution-drusus-reform.asp?pg=33