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
The moment was at least well chosen for such acts of homage. Polybius dates from the battle of Pydna the full establishment of the universal empire of Rome. It was in fact the last battle in which a civilized state confronted Rome in the field on a footing of equality with her as a great power; all subsequent struggles were rebellions or wars with peoples beyond the pale of the Romano-Greek civilization --with barbarians, as they were called.
The whole civilized world thenceforth recognized in the Roman senate the supreme tribunal, whose commissions decided in the last resort between kings and nations; and to acquire its language and manners foreign princes and youths of quality resided in Rome. A clear and earnest attempt to get rid of this dominion was in reality made only once--by the great Mithradates of Pontus.
The battle of Pydna, moreover, marks the last occasion on which the senate still adhered to the state-maxim that they should, if possible, hold no possessions and maintain no garrisons beyond the Italian seas, but should keep the numerous states dependent on them in order by a mere political supremacy.
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Reference address : https://www.ellopos.net/elpenor/rome/3-10-third-macedonian-war.asp?pg=52