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
Even the Aetolians, when their corps shut up in Heraclea had been compelled after obstinate resistance to capitulate, attempted to make their peace with the sorely provoked Romans; but the stringent demands of the Roman consul, and a consignment of money seasonably arriving from Antiochus, emboldened them once more to break off the negotiations and to sustain for two whole months a siege in Naupactus.
The town was already reduced to extremities, and its capture or capitulation could not have been long delayed, when Flamininus, constantly striving to save every Greek community from the worst consequences of its own folly and from the severity of his ruder colleagues, interposed and arranged in the first instance an armistice on tolerable terms. This terminated, at least for the moment, armed resistance in Greece.
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Reference address : https://www.ellopos.net/elpenor/rome/3-09-war-antiochus-asia.asp?pg=23