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
Conclusion of Peace - Expedition against the Celts of Asia Minor - Regulation of the Affairs of Asia Minor
The king sued for peace and consented to the terms proposed by the Romans, which, as usual, were just the same as those offered before the battle and consequently included the cession of Asia Minor. Till they were ratified, the army remained in Asia Minor at the expense of the king; which came to cost him not less than 3000 talents (730,000 pounds).
Antiochus himself in his careless fashion soon consoled himself for the loss of half his kingdom; it was in keeping with his character, that he declared himself grateful to the Romans for saving him the trouble of governing too large an empire. But with the day of Magnesia Asia was erased from the list of great states; and never perhaps did a great power fall so rapidly, so thoroughly, and so ignominiously as the kingdom of the Seleucidae under this Antiochus the Great.
He himself was soon afterwards (567) slain by the indignant inhabitants of Elymais at the head of the Persian gulf, on occasion of pillaging the temple of Bel, with the treasures of which he had sought to replenish his empty coffers.
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Reference address : https://www.ellopos.net/elpenor/rome/3-09-war-antiochus-asia.asp?pg=36