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
Consequences of the Defeat
The disaster, terrible in itself, seemed also as though it was to be dreadful in its consequences, and to shake the foundations of the Roman power in the east. It was among the least of its results that the Parthians now had absolute sway beyond the Euphrates; that Armenia, after having fallen away from the Roman alliance even before the disaster of Crassus, was reduced by it into entire dependence on Parthia; that the faithful citizens of Carrhae were bitterly punished for their adherence to the Occidentals by the new master appointed over them by the Parthians, one of the treacherous guides of the Romans, named Andromachus.
The Parthians now prepared in all earnest to cross the Euphrates in their turn, and, in union with the Armenians and Arabs, to dislodge the Romans from Syria. The Jews and various other Occidentals awaited emancipation from the Roman rule there, no less impatiently than the Greeks beyond the Euphrates awaited relief from the Parthian; in Rome civil war was at the door; an attack at this particular place and time was a grave peril. But fortunately for Rome the leaders on each side had changed. Sultan Orodes was too much indebted to the heroic prince, who had first placed the crown on his head and then cleared the land from the enemy, not to get rid of him as soon as possible by the executioner.
His place as commander-in-chief of the invading army destined for Syria was filled by a prince, the king's son Pacorus, with whom on account of his youth and inexperience the prince Osaces had to be associated as military adviser. On the other side the interim command in Syria in room of Crassus was taken up by the prudent and resolute quaestor Gaius Cassius.
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Reference address : https://www.ellopos.net/elpenor/rome/5-09-crassus-joint-rulers.asp?pg=16