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 War for the Numidian Succession
Soon afterwards, in 636, king Micipsa died. The testament came into force: but the two sons of Micipsa--the vehement Hiempsal still more than his weak elder brother--soon came into so violent collision with their cousin whom they looked on as an intruder into the legitimate line of succession, that the idea of a joint reign of the three kings had to be abandoned. An attempt was made to carry out a division of the heritage; but the quarrelling kings could not agree as to their quotas of land and treasure, and the protecting power, to which in this case the decisive word by right belonged, gave itself, as usual, no concern about this affair.
A rupture took place; Adherbal and Hiempsal were disposed to characterize their father's testament as surreptitious and altogether to dispute Jugurtha's right of joint inheritance, while on the other hand Jugurtha came forward as a pretender to the whole kingdom. While the discussions as to the partition were still going on, Hiempsal was made away with by hired assassins; then a civil war arose between Adherbal and Jugurtha, in which all Numidia took part. With his less numerous but better disciplined and better led troops Jugurtha conquered, and seized the whole territory of the kingdom, subjecting the chiefs who adhered to his cousin to the most cruel persecution.
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Reference address : https://www.ellopos.net/elpenor/rome/4-04-rule-restoration.asp?pg=29