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
At last the Roman senate was summoned by all parties to arbitrate on all these doings --an annoying task, which was the righteous punishment of the sentimental policy that the senate had pursued. Far from mixing itself up too much in these affairs, the senate not only bore the sarcasms of Achaean candour with exemplary composure, but even manifested a culpable indifference while the worst outrages were committed. There was cordial rejoicing in Achaia when, after that restoration, the news arrived from Rome that the senate had found fault with it, but had not annulled it.
Nothing was done for the Lacedaemonians by Rome, except that the senate, shocked at the judicial murder of from sixty to eighty Spartans committed by the Achaeans, deprived the diet of criminal jurisdiction over the Spartans--truly a heinous interference with the internal affairs of an independent state! The Roman statesmen gave themselves as little concern as possible about this tempest in a nut-shell, as is best shown by the many complaints regarding the superficial, contradictory, and obscure decisions of the senate; in fact, how could its decisions be expected to be clear, when there were four parties from Sparta simultaneously speaking against each other at its bar?
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Reference address : https://www.ellopos.net/elpenor/rome/3-09-war-antiochus-asia.asp?pg=55