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
Impression Produced in Rome by the Defeat of Carrhae
In Rome meanwhile the periodical volcano of revolution was whirling upward its clouds of stupefying smoke. The Romans began to have no longer a soldier or a denarius to be employed against the public foe-- no longer a thought for the destinies of the nations. It is one of the most dreadful signs of the times, that the huge national disaster of Carrhae and Sinnaca gave the politicians of that time far less to think and speak of than that wretched tumult on the Appian road, in which, a couple of months after Crassus, Clodius the partisan-leader perished; but it is easily conceivable and almost excusable.
The breach between the two regents, long felt as inevitable and often announced as near, was now assuming such a shape that it could not be arrested. Like the boat of the ancient Greek mariners' tale, the vessel of the Roman community now found itself as it were between two rocks swimming towards each other; expecting every moment the crash of collision, those whom it was bearing, tortured by nameless anguish, into the eddying surge that rose higher and higher were benumbed; and, while every slightest movement there attracted a thousand, eyes, no one ventured to give a glance to the right or the left.
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Reference address : https://www.ellopos.net/elpenor/rome/5-09-crassus-joint-rulers.asp?pg=18