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 provinces, which Caesar found in existence, were fourteen in number: seven European--the Further and the Hither Spain, Transalpine Gaul, Italian Gaul with Illyricum, Macedonia with Greece, Sicily, Sardinia with Corsica; five Asiatic--Asia, Bithynia and Pontus, Cilicia with Cyprus, Syria, Crete; and two African--Cyrene and Africa. To these Caesar added three new ones by the erection of the two new governorships of Lugdunese Gaul and Belgica(79) and by constituting Illyricum a province by itself.(80)
79. Cf. V. VII. Gaul Subdued
80. As according to Caesar's ordinance annually sixteen propraetors and two proconsuls divided the governorships among them, and the latter remained two years in office (p. 344), we might conclude that he intended to bring the number of provinces in all up to twenty. Certainty is, however, the less attainable as to this, seeing that Caesar perhaps designedly instituted fewer offices than candidatures.
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Reference address : https://www.ellopos.net/elpenor/rome/5-11-old-republic-new-monarchy.asp?pg=136