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
Castor, the commandant of the fortress Phanagoria (on the Asiatic coast opposite Kertch), first raised the standard of revolt; he proclaimed the freedom of the town and delivered the sons of Mithradates that were in the fortress into the hands of the Romans. While the insurrection spread among the Bosporan towns, and Chersonesus (not far from Sebastopol), Theudosia (Kaffa), and others joined the Phanagorites, the king allowed his suspicion and his cruelty to have free course. On the information of despicable eunuchs his most confidential adherents were nailed to the cross; the king's own sons were the least sure of their lives.
The son who was his father's favourite and was probably destined by him as his successor, Pharnaces, took his resolution and headed the insurgents. The servants whom Mithradates sent to arrest him, and the troops despatched against him, passed over to his side; the corps of Italian deserters, perhaps the most efficient among the divisions of Mithradates' army, and for that very reason the least inclined to share in the romantic--and for the deserters peculiarly hazardous--expedition against Italy, declared itself en masse for the prince; the other divisions of the army and the fleet followed the example thus set.
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Reference address : https://www.ellopos.net/elpenor/rome/5-04-pompeius-east.asp?pg=27