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
Men were living in an interregnum between the ruin of the aristocratic, and the rise of the military, rule; and, if the Roman commonwealth has presented all the different political functions and organizations more purely and normally than any other in ancient or modern times, it has also exhibited political disorganization-anarchy-- with an unenviable clearness. It is a strange coincidence that in the same years, in which Caesar was creating beyond the Alps a workto last for ever, there was enacted in Rome one of the most extravagant political farces that was ever produced upon the stage of the world's history.
The new regent of the commonwealth did not rule, but shut himself up in his house and sulked in silence. The former half-deposed government likewise did not rule, but sighed, sometimes in private amidst the confidential circles of the villas, sometimes in chorus in the senate-house. The portion of the burgesses which had still at heart freedom and order was disgusted with the reign of confusion, but utterly without leaders and counsel it maintained a passive attitude-not merely avoiding all political activity, but keeping aloof, as far as possible, from the political Sodom itself.
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Reference address : https://www.ellopos.net/elpenor/rome/5-08-pompeius-caesar.asp?pg=4