This is from The Book of Sun-Dials by Mrs. Alfred Gatty [aka Margaret Scott Gatty], which you can read online at this University of Pennsylvania website.
Hora Finalis
Hora horis cedit, pereunt sic tempora nobis;
Ut tibi finalis sit bona, vive bene.
The vocabulary is keyed to the DCC Latin Vocabulary list. There is only one word in this poem that is not on the DCC list:
fīnālis, -e (fīnālis): last, final
bene: well
bonus -a -um: good
cēdō cēdere cessī cessum: yield
hōra -ae f.: hour
nōs nostrum/nostrī nobis nōs: we
pereō -īre -iī -itum: perish, be lost
sīc: in this manner, thus; sīc . . . ut: in the same way as
sum, esse, fuī: be, exist
tempus -oris n.: time
tū tuī tibi tē: you (sing.)
ut, uti: as (+ indic.); so that, with the result that (+ subj.)
vīvō vīvere vīxī victum: live
