How to config the timeline view for a single day

I hope the timeline only show a single day with 1-hour steps, and for the working hours (say, 8:00-20:00).
The current timeline view shows several days. Even if I set the colsCount property, the number of cols changes, but the hours are still continuous to 21:00 until 0:00 the next day, instead of the next 8:00-20:00.
I tried many, but find no solution.
Thx