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
Oldest Table of Roman Festivals
We obtain information regarding the original cycle of the gods, as it stood in Rome previous to any contact with the Greeks, from the list of the public and duly named festival-days (-feriae publicae-) of the Roman community, which is preserved in its calendar and is beyond all question the oldest document which has reached us from Roman antiquity. The first place in it is occupied by the gods Jupiter and Mars along with the duplicate of the latter, Quirinus.
To Jupiter all the days of full moon (-idus-) are sacred, besides all the wine-festivals and various other days to be mentioned afterwards; the 21st May (-agonalia-) is dedicated to his counterpart, the "bad Jovis" (-Ve-diovis-). To Mars belongs the new-year of the 1st March, and generally the great warrior-festival in this month which derived its very name from the god; this festival, introduced by the horse-racing (-equirria-) on the 27th February, had during March its principal solemnities on the days of the shield-forging (-equirria- or -Mamuralia-, March 14), of the armed dance at the Comitium (-quinquatrus-, March 19), and of the consecration of trumpets (-tubilustrium-, March 23).
As, when a war was to be waged, it began with this festival, so after the close of the campaign in autumn there followed a further festival of Mars, that of the consecration of arms (-armilustrium-, October 19). Lastly, to the second Mars, Quirinus, the 17th February was appropriated (-Quirinalia-).
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Reference address : https://www.ellopos.net/elpenor/rome/1-12-religion.asp?pg=2