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
If he, who was still surrounded with the full lustre of his extraordinary successes, should now offer to go to the east, he would beyond doubt be readily invested by the burgesses with all the plenitude of military and political power which he might himself ask. For the oligarchy, which saw in the political-military dictatorship their certain ruin, and in Pompeius himself since the coalition of 683 their most hated foe, this was an overwhelming blow; but the democratic party also could have little comfort in the prospect.
However desirable the putting an end to the government of the senate could not but be in itself, it was, if it took place in this way, far less a victory for their party than a personal victory for their over-powerful ally. In the latter there might easily arise a far more dangerous opponent to the democratic party than the senate had been. The danger fortunately avoided a few years before by the disbanding of the Spanish army and the retirement of Pompeius would recur in increased measure, if Pompeius should now be placed at the head of the armies of the east.
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Reference address : https://www.ellopos.net/elpenor/rome/5-03-fall-oligarchy-pompeius.asp?pg=24