His reading was extraordinarily methodical (see his Literary Remains). The value of his Fasti, which set classical chronology on a scientific basis, can scarcely be overestimated, even though subsequent research has corrected some of his conclusions.
His chief works are: Fasti Hellenici, the Civil and Literary Chronology of Greece from the 55th to the 124th Olympiad (1824-1851), including dissertations on points of Greek history and Scriptural chronology; and Fasti Romani, the Civil and Literary Chronology of Rome and Constantinople from the Death of Augustus to the Death of Heraclius (1845-1850). In 1851 and 1853 respectively he published epitomes of the above. The Literary Remains of H. F. Clinton (the first part of which contains an autobiography written in 1818) were edited by Clinton James Fynes Clinton in 1854.