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
Pompeius and the Capital - Anarchy
But when Pompeius was appointed by the coalition to be ruler of the capital, he undertook a task far exceeding his powers. Pompeius understood nothing further of ruling than may be summed up in the word of command. The waves of agitation in the capital were swelled at once by past and by future revolutions; the problem of ruling this city--which in every respect might be compared to the Paris of the nineteenth century--without an armed force was infinitely difficult, and for that stiff and stately pattern-soldier altogether insoluble. Very soon matters reached such a pitch that friends and foes, both equally inconvenient to him, could, so far as he was concerned, do what they pleased; after Caesar's departure from Rome the coalition ruled doubtless still the destinies of the world, but not the streets of the capital.
The senate too, to whom there still belonged a sort of nominal government, allowed things in the capital to follow their natural course; partly because the section of this body controlled by the coalition lacked the instructions of the regents, partly because the angry opposition kept aloof out of indifference or pessimism, but chiefly because the whole aristocratic corporation began to feel at any rate, if not to comprehend, its utter impotence. For the moment therefore there was nowhere at Rome any power of resistance in any sort of government, nowhere a real authority.
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Reference address : https://www.ellopos.net/elpenor/rome/5-08-pompeius-caesar.asp?pg=3