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
From the first Crassus had played a subordinate part in the coalition; he had been obliged to propose himself, and owed even his election to the consulship mainly to the proud intercession of Pompeius. Far the stronger, Pompeius was evidently master of the situation; if he availed himself of it, it seemed as if he could not but become what the instinct of the multitude even now designated him--the absolute ruler of the mightiest state in the civilized world. Already the whole mass of the servile crowded around the future monarch.
Already his weaker opponents were seeking their last resource in a new coalition; Crassus, full of old and recent jealousy towards the younger rival who so thoroughly outstripped him, made approaches to the senate and attempted by unprecedented largesses to attach to himself the multitude of the capital--as if the oligarchy which Crassus himself had helped to break down, and the ever ungrateful multitude, would have been able to afford any protection whatever against the veterans of the Spanish army. For a moment it seemed as if the armies of Pompeius and Crassus would come to blows before the gates of the capital.
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Reference address : https://www.ellopos.net/elpenor/rome/5-03-fall-oligarchy-pompeius.asp?pg=18