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
He thus consented to those proposals of accommodation, with which at the beginning of the discussions the senatorial party and even Pompeius himself had declared that they would be satisfied, and showed himself ready to remain in a private position from his election to the consulate down to his entering on office.
Whether Caesar was in earnest with these astonishing concessions and had confidence that he should be able to carry through his game against Pompeius even after granting so much, or whether he reckoned that those on the other side had already gone too far to find in these proposals of compromise more than a proof that Caesar regarded his cause itself as lost, can no longer be with certainty determined. The probability is, that Caesar committed the fault of playing a too bold game, far worse rather than the fault of promising something which he was not minded to perform; and that, if strangely enough his proposals had been accepted, he would have made good his word.
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Reference address : https://www.ellopos.net/elpenor/rome/5-09-crassus-joint-rulers.asp?pg=50