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
Pyrrhus, who could not exercise sovereignty over Macedonia with the consent of the Macedonians, and who was too powerless and perhaps too high spirited to force himself on the nation against its will, after reigning seven months left the country to its native misgovernment, and went home to his faithful Epirots (467).
But the man who had worn the crown of Alexander, the brother-in-law of Demetrius, the son-in-law of Ptolemy Lagides and of Agathocles of Syracuse, the highly-trained tactician who wrote memoirs and scientific dissertations on the military art, could not possibly end his days in inspecting at a set time yearly the accounts of the royal cattle steward, in receiving from his brave Epirots their customary gifts of oxen and sheep, in thereupon, at the altar of Zeus, procuring the renewal of their oath of allegiance and repeating his own engagement to respect the laws, and--for the better confirmation of the whole--in carousing with them all night long.
If there was no place for him on the throne of Macedonia, there was no abiding in the land of his nativity at all; he was fitted for the first place, and he could not be content with the second. His views therefore turned abroad. The kings, who were quarrelling for the possession of Macedonia, although agreeing in nothing else, were ready and glad to concur in aiding the voluntary departure of their dangerous rival; and that his faithful war-comrades would follow him where-ever he led, he knew full well.
Just at that time the circumstances of Italy were such, that the project which had been meditated forty years before by Pyrrhus's kinsman, his father's cousin, Alexander of Epirus, and quite recently by his father-in-law Agathocles, once more seemed feasible; and so Pyrrhus resolved to abandon his Macedonian schemes and to found for himself and for the Greek nation a new empire in the west.
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Reference address : https://www.ellopos.net/elpenor/rome/2-07-pyrrhus-rome-italy.asp?pg=10