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
It was otherwise with the Achaeans. They had, in the course of the war with Antiochus, gratified their long-cherished wish to bring the whole Peloponnesus into their confederacy; for first Sparta, and then, after the expulsion of the Asiatics from Greece, Elis and Messene had more or less reluctantly joined it. The Romans had allowed this to take place, and had even tolerated the intentional disregard of Rome which marked their proceedings.
When Messene declared that she wished to submit to the Romans but not to enter the confederacy, and the latter thereupon employed force, Flamininus had not failed to remind the Achaeans that such separate arrangements as to the disposal of a part of the spoil were in themselves unjust, and were, in the relation in which the Achaeans stood to the Romans, more than unseemly; and yet in his very impolitic complaisance towards the Greeks he had substantially done what the Achaeans willed. But the matter did not end there.
The Achaeans, tormented by their dwarfish thirst for aggrandizement, would not relax their hold on the town of Pleuron in Aetolia which they had occupied during the war, but on the contrary made it an involuntary member of their confederacy; they bought Zacynthus from Amynander the lieutenant of the last possessor, and would gladly have acquired Aegina also. It was with reluctance that they gave up the former island to Rome, and they heard with great displeasure the good advice of Flamininus that they should content themselves with their Peloponnesus.
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Reference address : https://www.ellopos.net/elpenor/rome/3-09-war-antiochus-asia.asp?pg=51