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
Negotiations of Parties with the Italians - Death of Strabo
The senate was not, however, inclined to throw itself into the arms of one usurper in order to escape from another, and sought help elsewhere. The franchise was by decree of the senate supplementarily conferred on all the Italian communities involved in the Social war, which had laid down their arms and had in consequence thereof forfeited their old alliance.(2)
2. Cf. IV. VII. The Bestowal of the Franchise and Its Limitations. That there was no confirmation by the comitia, is clear from Cic. Phil. xii. 11, 27. The senate seems to have made use of the form of simply prolonging the term of the Plautio- Papirian law (Cf. IV. VII. Bestowal of Latin Rights on the Italian Celts), a course which by use and wont (i. 409) was open to it and practically amounted to conferring the franchise on all Italians.
It seemed as it were their intention officially to demonstrate that Rome in the war against the Italians had staked her existence for the sake not of a great object but of her own vanity: in the first momentary embarrassment, for the purpose of bringing into the field an additional thousand or two of soldiers, she sacrificed everything which had been gained at so terribly dear a cost in the Social war.
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Reference address : http://www.ellopos.net/elpenor/rome/4-09-cinna-sulla.asp?pg=11