I plan on saying this line at 11:59pm on New Year's in 2019<h1>Kappa</h1>
Ah! So you think this decade will end in 2019 not 2020? That opens up a whole new debate . . .
Decènnio is from L. decem (=10) anni (=years), dècade was the name given by the Old Greek (dekàs/dekadòs = ten) to a period of ten days
Although "is over" looks like a present simple tense it actually means "has finished" which indicates present-state reached in the past. In Italian this would be "è finito" (or possibly "ha finito"), whereas in this sentence we have "finisce" which is present tense and thus should be translated as "finishes/ends" or possibly "is finishing" / "is ending"
the pronunciation of ¨decennio" is awful even after many tries could not understand