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
Beginning of the War
But, though Perseus stood almost alone, he was no contemptible antagonist. His army numbered 43,000 men; of these 21,000 were phalangites, and 4000 Macedonian and Thracian cavalry; the rest were chiefly mercenaries. The whole force of the Romans in Greece amounted to between 30,000 and 40,000 Italian troops, besides more than 10,000 men belonging to Numidian, Ligurian, Greek, Cretan, and especially Pergamene contingents.
To these was added the fleet, which numbered only 40 decked vessels, as there was no fleet of the enemy to oppose it--Perseus, who had been prohibited from building ships of war by the treaty with Rome, was only now erecting docks at Thessalonica--but it had on board 10,000 troops, as it was destined chiefly to co-operate in sieges. The fleet was commanded by Gaius Lucretius, the land army by the consul Publius Licinius Crassus.
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Reference address : https://www.ellopos.net/elpenor/rome/3-10-third-macedonian-war.asp?pg=21