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
This may be called a barbarous custom, and a nation of artistic feelings would certainly not have tolerated the continuance of this odd resurrection of the dead down to an epoch of fully-developed civilization; but even Greeks who were very dispassionate and but little disposed to reverence, such as Polybius, were greatly impressed by the naive pomp of this funeral ceremony.
It was a conception essentially in keeping with the grave solemnity, the uniform movement, and the proud dignity of Roman life, that departed generations should continue to walk, as it were, corporeally among the living, and that, when a burgess weary of labours and of honours was gathered to his fathers, these fathers themselves should appear in the Forum to receive him among their number.
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Reference address : https://www.ellopos.net/elpenor/rome/3-13-faith-manners.asp?pg=5