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
The wretched government oppressed the land more heavily than did the barbarians: on him, the first man of Rome, the favourite of the people, the head of the opposition, devolved the task of once more delivering Rome. It is true that to one who was a rustic and a soldier the political proceedings of the capital were strange and incongruous: he spoke as ill as he commanded well, and displayed a far firmer bearing in presence of the lances and swords of the enemy than in presence of the applause or hisses of the multitude; but his inclinations were of little moment.
The hopes of which he was the object constrained him. His military and political position was such that, if he would not break with the glorious past, if he would not deceive the expectations of his party and in fact of the nation, if he would not be unfaithful to his own sense of duty, he must check the maladministration of public affairs and put an end to the government of the restoration; and if he only possessed the internal qualities of a head of the people, he might certainly dispense with those which he lacked as a popular leader.
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Reference address : https://www.ellopos.net/elpenor/rome/4-06-marius-revolution-drusus-reform.asp?pg=6