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
Yet he might say that he had not lived in vain. It was to him, at least quite as much as to the author of the Sempronian law, that the Roman burgesses were indebted for an increase of nearly 80,000 new farm-allotments; he it was too who put a stop to this distribution of the domains, when it had produced such benefit as it could produce.
That it was time to break it off, was no doubt disputed at the moment even by well-meaning men; but the fact that Gaius Gracchus did not seriously recur to those possessions which might have been, and yet were not, distributed under the law of his brother, tells very much in favour of the belief that Scipio hit substantially the right moment. Both measures were extorted from the parties--the first from the aristocracy, the second from the friends of reform; for each its author paid with his life.
It was Scipio's lot to fight for his country on many a battle-field and to return home uninjured, that he might perish there by the hand of an assassin; but in his quiet chamber he no less died for Rome than if he had fallen before the walls of Carthage.
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Reference address : https://www.ellopos.net/elpenor/rome/4-03-revolution-gaius-gracchus.asp?pg=9