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
No one can deny that he possessed sagacity and resolution, but these were, in a singular manner, combined with procrastination and supineness; which is perhaps partly to be explained by the fact, that he was called in his eighteenth year to the position of an absolute sovereign, and that his ungovernable fury against every one who disturbed his autocratic course by counter-argument or counter-advice scared away from him all independent counsellors.
What various causes cooperated to produce the weak and disgraceful management which he showed in the first Macedonian war, we cannot tell; it may have been due perhaps to that indolent arrogance which only puts forth its full energies against danger when it becomes imminent, or perhaps to his indifference towards a plan which was not of his own devising and his jealousy of the greatness of Hannibal which put him to shame.
It is certain that his subsequent conduct betrayed no further trace of the Philip, through whose negligence the plan of Hannibal suffered shipwreck.
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Reference address : https://www.ellopos.net/elpenor/rome/3-08-second-macedonian-war.asp?pg=20