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
Character and Earlier History of Pyrrhus
King Pyrrhus was the son of Aeacides, ruler of the Molossians (about Janina), who, spared as a kinsman and faithful vassal by Alexander, had been after his death drawn into the whirlpool of Macedonian family-politics, and lost in it first his kingdom and then his life (441). His son, then six years of age, was saved by Glaucias the ruler of the Illyrian Taulantii, and in the course of the conflicts for the possession of Macedonia he was, when still a boy, restored by Demetrius Poliorcetes to his hereditary principality (447)--but only to lose it again after a few years through the influence of the opposite party (about 452), and to begin his military career as an exiled prince in the train of the Macedonian generals.
Soon his personality asserted itself. He shared in the last campaigns of Antigonus; and the old marshal of Alexander took delight in the born soldier, who in the judgment of the grey-headed general only wanted years to be already the first warrior of the age. The unfortunate battle at Ipsus brought him as a hostage to Alexandria, to the court of the founder of the Lagid dynasty, where by his daring and downright character, and his soldierly spirit thoroughly despising everything that was not military, he attracted the attention of the politic king Ptolemy no less than he attracted the notice of the royal ladies by his manly beauty, which was not impaired by his wild look and stately tread.
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Reference address : https://www.ellopos.net/elpenor/rome/2-07-pyrrhus-rome-italy.asp?pg=8