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
Perhaps it was possible to find out for his awkward, vacillating, and arrogant rival some sort of honourable and influential position, in which the latter might be content to sink into a nullity; the repeated attempts of Caesar to keep himself related by marriage to Pompeius, may have been designed to pave the way for such a solution and to bring about a final settlement of the old quarrel through the succession of offspring inheriting the blood of both competitors.
The republican opposition would then remain without a leader and therefore probably quiet, and peace would be preserved. If this should not be successful, and if there should be, as was certainly possible, a necessity for ultimately resorting to the decision of arms, Caesar would then as consul in Rome dispose of the compliant majority of the senate; and he could impede or perhaps frustrate the coalition of the Pompeians and the republicans, and conduct the war far more suitably and more advantageously, than if he now as proconsul of Gaul gave orders to march against the senate and its general.
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Reference address : https://www.ellopos.net/elpenor/rome/5-09-crassus-joint-rulers.asp?pg=32