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 home of the Indo-Germanic stock lay in the western portion of central Asia; from this it spread partly in a south-eastern direction over India, partly in a northwestern over Europe. It is difficult to determine the primitive seat of the Indo-Germans more precisely: it must, however, at any rate have been inland and remote from the sea, as there is no name for the sea common to the Asiatic and European branches. Many indications point more particularly to the regions of the Euphrates; so that, singularly enough, the primitive seats of the two most important civilized stocks, --the Indo-Germanic and the Aramaean,--almost coincide as regards locality. This circumstance gives support to the hypothesis that these races also were originally connected, although, if there was such a connection, it certainly must have been anterior to all traceable development of culture and language.
We cannot define more exactly their original locality, nor are we able to accompany the individual stocks in the course of their migrations. The European branch probably lingered in Persia and Armenia for some considerable time after the departure of the Indians; for, according to all appearance, that region has been the cradle of agriculture and of the culture of the vine. Barley, spelt, and wheat are indigenous in Mesopotamia, and the vine tothe south of the Caucasus and of the Caspian Sea: there too the plum, the walnut, and others of the more easily transplanted fruit trees are native. It is worthy of notice that the name for the sea is common to most of the European stocks--Latins, Celts, Germans, and Slavonians; they must probably therefore before their separation have reached the coast of the Black Sea or of the Caspian. By what route from those regions the Italians reached the chain of the Alps, and where in particular they were settled while still united with the Greeks alone, are questions that can only be answered when the problem is solved by what route--whether from Asia Minor or from the regions of the Danube--the Greeks arrived in Greece. It may at all events be regarded as certain that the Italians, like the Indians, migrated into their peninsula from the north.(1)
1. See I. II. Italians
The advance of the Umbro-Sabellian stock along the central mountain-ridge of Italy, in a direction from north to south, can still be clearly traced; indeed its last phases belong to purely historical times. Less is known regarding the route which the Latin migration followed. Probably it proceeded in a similar direction along the west coast, long, in all likelihood, before the first Sabellian stocks began to move. The stream only overflows the heights when the lower grounds are already occupied; and only through the supposition that there were Latin stocks already settled on the coast are we able to explain why the Sabellians should have contented themselves with the rougher mountain districts, from which they afterwards issued and intruded, wherever it was possible, between the Latin tribes.
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Reference address : https://www.ellopos.net/elpenor/rome/1-03-settlements-latins.asp