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
Preparations of Mithradates
Mithradates prosecuted the political and military preparations for the passage of arms thus forced upon him with all his characteristic energy. First of all he drew closer his alliance with Tigranes king of Armenia, and obtained from him the promise of an auxiliary army which was to march into western Asia and to take possession of the soil there for king Mithradates and of the moveable property for king Tigranes. The Parthian king, offended by the haughty carriage of Sulla, though not exactly coming forward as an antagonist to the Romans, did not act as their ally.
To the Greeks the king endeavoured to present himself in the character of Philip and Perseus, as the defender of the Greek nation against the alien rule of the Romans. Pontic envoys were sent to the king of Egypt and to the last remnant of free Greece, the league of the Cretan cities, and adjured those for whom Rome had already forged her chains to rise now at the last moment and save Greek nationality; the attempt was in the case of Crete at least not wholly in vain, and numerous Cretans took service in the Pontic army.
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Reference address : https://www.ellopos.net/elpenor/rome/4-08-east-king-mithradates.asp?pg=37