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
The tribunes of the people, Marcus Antonius well known in the chronicle of scandal of the city as the intimate friend of Curio and his accomplice in all his follies, but at the same time known from the Egyptian and Gallic campaigns as a brilliant cavalry officer, and Quintus Cassius, Pompeius' former quaestor,--the two, who were now in Curio's stead managing the cause of Caesar in Rome-- insisted on the immediate reading of the despatch.
The grave and clear words in which Caesar set forth the imminence of civil war, the general wish for peace, the arrogance of Pompeius, and his own yielding disposition, with all the irresistible force of truth; the proposals for a compromise, of a moderation which doubtless surprised his own partisans; the distinct declaration that this was the last time that he should offer his hand for peace-- made the deepest impression.
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Reference address : https://www.ellopos.net/elpenor/rome/5-09-crassus-joint-rulers.asp?pg=52