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 Roman House
Father and mother, sons and daughters, home and homestead, servants and chattels--such are the natural elements constituting the household in all cases, where polygamy has not obliterated the distinctive position of the mother. But the nations that have been most susceptible of culture have diverged widely from each other in their conception and treatment of the natural distinctions which the household thus presents. By some they have been apprehended and wrought out more profoundly, by others more superficially; by some more under their moral, by others more under their legal aspects. None has equalled the Roman in the simple but inexorable embodiment in law of the principles pointed out by nature herself.
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Reference address : https://www.ellopos.net/elpenor/rome/1-05-original-constitution-rome.asp