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
Rupture with Perseus
The senate saw that it had delayed too long already, and that it was time to put an end to such proceedings. The expulsion of the Thracian chieftain Abrupolis who was in alliance with the Romans, and the alliances of Macedonia with the Byzantines, Aetolians, and part of the Boeotian cities, were equally violations of the peace of 557, and sufficed for the official war-manifesto: the real ground of war was that Macedonia was seeking to convert her formal sovereignty into a real one, and to supplant Rome in the protectorate of the Greeks.
As early as 581 the Roman envoys at the Achaean diet stated pretty plainly, that an alliance with Perseus was equivalent to casting off the alliance of Rome. In 582 king Eumenes came in person to Rome with a long list of grievances and laid open to the senate the whole situation of affairs; upon which the senate unexpectedly in a secret sitting resolved on an immediate declaration of war, and furnished the landing-places in Epirus with garrisons.
For the sake of form an embassy was sent to Macedonia, but its message was of such a nature that Perseus, perceiving that he could not recede, replied that he was ready to conclude with Rome a new alliance on really equal terms, but that he looked upon the treaty of 557 as cancelled; and he bade the envoys leave the kingdom within three days. Thus war was practically declared.
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Reference address : https://www.ellopos.net/elpenor/rome/3-10-third-macedonian-war.asp?pg=17