I looked up "kani" in the dictionary expecting some kind of now/precisely meaning, but thatʻs not what the book said. Kani has many interesting meanings having to do with sound and fitness, but the closest meaning for time--and you have appreciate this--is the crack of a whip. :-D
"Strike" may be a reasonable interpretation for "kani." "Kani ka hola" meaning "The hour strikes."
Hola ʻehia kēia? = What time is it?
Kani ka hola ʻekahi. = It is now one o'clock.