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
Difficulties with Rome
This enterprise had an indirect bearing on the Romans who from the first had laid it down as a condition for Philip that he should withdraw his garrisons from Asia Minor and should leave to the Rhodians and Pergamenes their territory and to the free cities their former constitution unimpaired, and who had now to look on while Antiochus took possession of them in Philip's place. Attalus and the Rhodians found themselves now directly threatened by Antiochus with precisely the same danger as had driven them a few years before into the war with Philip; and they naturally sought to involve the Romans in this war as well as in that which had just terminated.
Already in 555-6 Attalus had requested from the Romans military aid against Antiochus, who had occupied his territory while the troops of Attalus were employed in the Roman war. The more energetic Rhodians even declared to king Antiochus, when in the spring of 557 his fleet appeared off the coast of Asia Minor, that they would regard its passing beyond the Chelidonian islands (off the Lycian coast) as a declaration of war; and, when Antiochus did not regard the threat, they, emboldened by the accounts that had just arrived of the battle at Cynoscephalae, had immediately begun the war and had actually protected from the king the most important of the Carian cities, Caunus, Halicarnassus, and Myndus, and the island of Samos.
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Reference address : https://www.ellopos.net/elpenor/rome/3-09-war-antiochus-asia.asp?pg=4