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
Wide Influence of Stoicism - Panaetius
So this philosophy thoroughly incorporated itself, as a plant borrowed no doubt from abroad but acclimatized on Italian soil, with the Roman national economy, and we meet its traces in the most diversified spheres of action. Its earliest appearance beyond doubt goes further back; but the Stoa was first raised to full influence in the higher ranks of Roman society by means of the group which gathered round Scipio Aemilianus.
Panaetius of Rhodes, the instructor of Scipio and of all Scipio's intimate friends in the Stoic philosophy, who was constantly in his train and usually attended him even on journeys, knew how to adapt the system to clever men of the world, to keep its speculative side in the background, and to modify in some measure the dryness of the terminology and the insipidity of its moral catechism, more particularly by calling in the aid of the earlier philosophers, among whom Scipio himself had an especial predilection for the Socrates of Xenophon.
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Reference address : https://www.ellopos.net/elpenor/rome/4-12-nationality-religion-education.asp?pg=21