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
Pontic Invasion of Europe - Predatory Inroads of the Thracians - Thrace and Macedonia Occupied by the Pontic Armies - Pontic Fleet in the Aegean
But not only was the Asiatic province occupied by Mithradates almost without defending itself, chiefly in consequence of the Sulpician revolution breaking out at a most unfavourable time; Mithradates even directed an attack against Europe. Already since 662 the neighbours of Macedonia on her northern and eastern frontier had been renewing their incursions with remarkable vehemence and perseverance; in the years 664, 665 the Thracians overran Macedonia and all Epirus and plundered the temple of Dodona.
Still more singular was the circumstance, that with these movements was combined a renewed attempt to place a pretender on the Macedonian throne in the person of one Euphenes. Mithradates, who from the Crimea maintained connections with the Thracians, was hardly a stranger to all these events. The praetor Gaius Sentius defended himself, it is true, against these intruders with the aid of the Thracian Dentheletae; but it was not long before mightier opponents came against him.
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Reference address : https://www.ellopos.net/elpenor/rome/4-08-east-king-mithradates.asp?pg=45