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
Aquillius Brings about War - Nicomedes
Thus matters stood between peace and war, and looked quite as if they would drag on for long in the same indecisive position. But it was not the intention of Aquillius to allow this; and, as he could not compel his government to declare war against Mithradates, he made use of Nicomedes for that purpose. The latter, who was under the power of the Roman general and was, moreover, his debtor for the accumulated war expenses and for sums promised to the general in person, could not avoid complying with the suggestion that he should begin war with Mithradates.
The declaration of war by Bithynia took place; but, even when the vessels of Nicomedes closed the Bosporus against those of Pontus, and his troops marched into the frontier districts of Pontus and laid waste the region of Amastris, Mithradates remained still unshaken in his policy of peace; instead of driving the Bithynians over the frontier, he lodged a complaint with the Roman envoys and asked them either to mediate or to allow him the privilege of self-defence. But he was informed by Aquillius, that he must under all circumstances refrain from war against Nicomedes. That indeed was plain.
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Reference address : https://www.ellopos.net/elpenor/rome/4-08-east-king-mithradates.asp?pg=35