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
There was however another way perhaps more sure, at any rate better adapted to the character and nature of these constitutionalists; they might labour to set the two regents at variance and through this variance to attain ultimately to the helm themselves. The relations between the two men ruling the state had become altered and relaxed, now that Caesar had acquired a standing of preponderant power by the side of Pompeius and had compelled the latter to canvass for a new position of command; it was probable that, if he obtained it, there would arise in one way or other a rupture and struggle between them.
If Pompeius remained unsupported in this, his defeat was scarcely doubtful, and the constitutional party would in that event find themselves after the close of the conflict under the rule of one master instead of two. But if the nobility employed against Caesar the same means by which the latter had won his previous victories, and entered into alliance with the weaker competitor, victory would probably, with a general like Pompeius, and with an army such as that of the constitutionalists, fall to the coalition; and to settle matters with Pompeius after the victory could not-- judging from the proofs of political incapacity which he had already given-appear a specially difficult task.
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Reference address : https://www.ellopos.net/elpenor/rome/5-08-pompeius-caesar.asp?pg=17