Examples are: ``Jack was killed on xx/xx/1990,'' it happened sometime in 1999,'' ``the Jurassic is sometime after the Triassic,'' ``the French revolution occurred 397 years after the discovering of America.''
In particular, consider the statement ``the French revolution occurred 397 years after the discovering of America'', where the occurrence time of ``the French revolution'' is given with respect to the occurrence time of ``the discovering of America'' by means of the temporal qualifier ``397 years after'' (relative time). This statement is chronologically definite, because its truth value does not depend on the time at which it is evaluated.