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
This was in the autumn of 582. Perseus, had he wished, might have occupied all Greece and brought the Macedonian party everywhere to the helm, and he might perhaps have crushed the Roman division of 5000 men stationed under Gnaeus Sicinius at Apollonia and have disputed the landing of the Romans. But the king, who already began to tremble at the serious aspect of affairs, entered into discussions with his guest-friend the consular Quintus Marcius Philippus, as to the frivolousness of the Roman declaration of war, and allowed himself to be thereby induced to postpone the attack and once more to make an effort for peace with Rome: to which the senate, as might have been expected, only replied by the dismissal of all Macedonians from Italy and the embarkation of the legions.
Senators of the older school no doubt censured the "new wisdom" of their colleague, and his un-Roman artifice; but the object was gained and the winter passed away without any movement on the part of Perseus. The Romati diplomatists made all the more zealous use of the interval to deprive Perseus of any support in Greece. They were sure of the Achaeans. Even the patriotic party among them--who had neither agreed with those social movements, nor had soared higher than the longing after a prudent neutrality--had no idea of throwing themselves into the arms of Perseus; and, besides, the opposition party there had now been brought by Roman influence to the helm, and attached itself absolutely to Rome.
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Reference address : https://www.ellopos.net/elpenor/rome/3-10-third-macedonian-war.asp?pg=18