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
Without troops to keep the field and without money, Pyrrhus applied to his allies who had contributed to his equipment for Italy, the kings of Macedonia and Asia; but even in his native land he was no longer feared, and his request was refused. Despairing of success against Rome and exasperated by these refusals, Pyrrhus left a garrison in Tarentum, and went home himself in the same year (479) to Greece, where some prospect of gain might open up to the desperate player sooner than amidst the steady and measured course of Italian affairs.
In fact, he not only rapidly recovered the portion of his kingdom that had been taken away, but once more grasped, and not without success, at the Macedonian throne. But his last plans also were thwarted by the calm and cautious policy of Antigonus Gonatas, and still more by his own vehemence and inability to tame his proud spirit; he still gained battles, but he no longer gained any lasting success, and met his death in a miserable street combat in Peloponnesian Argos (482).
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Reference address : https://www.ellopos.net/elpenor/rome/2-07-pyrrhus-rome-italy.asp?pg=50