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
The following poem, belonging, it is true, to a far later age, may give an idea of it:--
Quod re sua difeidens--aspere afleicta
Parens timens heic vovit--voto hoc soluto
Decuma facta poloucta--leibereis lubentis
Semol te orant se voti--crebro con__demnes.
That which, misfortune dreading--sharply to afflict him, An anxious parent vowed here,--when his wish was granted, A sacred tenth for banquet--gladly give his children to Hercules a tribute--most of all deserving; And now they thee beseech, that--often thou wouldst hear them.
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Reference address : https://www.ellopos.net/elpenor/rome/1-15-art.asp?pg=11