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 Greek culture was in this case far from being set aside by the Romans; Massilia gained through them more influence than it lost; and even in the Roman period Greek physicians and rhetoricians were publicly employed in the Gallic cantons. But, as may readily be conceived, Hellenism in southern Gaul acquired through the agency of the Romans the same character as in Italy; the distinctively Greek civilization gave place to the Latino-Greek mixed culture, which soon made proselytes here in great numbers.
The "Gauls in the breeches," as the inhabitants of southern Gaul were called by way of contrast to the "Gauls in the toga" of northern Italy, were not indeed like the latter already completely Romanized, but they were even now very perceptibly distinguished from the "longhaired Gauls" of the northern regions still unsubdued. The semiculture becoming naturalized among them furnished, doubtless, materials enough for ridicule of their barbarous Latin, and people did not fail to suggest to any one suspected of Celtic descent his "relationship with the breeches"; but this bad Latin was yet sufficient to enable even the remote Allobroges to transact business with the Roman authorities, and even to give testimony in the Roman courts without an interpreter.
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Reference address : https://www.ellopos.net/elpenor/rome/5-07-subjugation-west.asp?pg=11