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
With this purpose in view they gave it clearly to be understood that the senate forgave the father for the sake of the son; the natural effect of which was, that dissensions arose in the royal household itself, and that the king's elder son, Perseus, who, although the offspring of an unequal marriage, was destined by his father for the succession, sought to ruin his brother as his future rival. It does not appear that Demetrius was a party to the Roman intrigues; it was only when he was falsely suspected that he was forced to become guilty, and even then he intended, apparently, nothing more than flight to Rome.
But Perseus took care that his father should be duly informed of this design; an intercepted letter from Flamininus to Demetrius did the rest, and induced the father to give orders that his son should be put to death. Philip learned, when it was too late, the intrigues which Perseus had concocted; and death overtook him, as he was meditating the punishment of the fratricide and his exclusion from the throne. He died in 575 at Demetrias, in his fifty-ninth year. He left behind him a shattered kingdom and a distracted household, and with a broken heart confessed to himself that all his toils and all his crimes had been in vain.
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Reference address : https://www.ellopos.net/elpenor/rome/3-10-third-macedonian-war.asp?pg=5