What is the word 'tapan' as in nevè tapan? Thanks

tapan → on the dot

nevè tapan → nine on the dot

Nou te rive legliz la a dizè tapan.
We arrived at the church at exactly ten o'clock.

Seremoni maryaj la va koumanse a sizè tapan.
The wedding ceremony will begin at exactly six o'clock.
Haitian Creole ↔ English Reference, Look up Haitian Creole and English Words