Gantt 2.2.3 chart issue classroom data

Hello All,

Need assistance while creating a gantt 2.2.3 chart. I have fields such as Room_number, Building_cd, course start date, course end date.  I want to show -

1. when the rooms/buildings are occupied in the particular day time.

2. The chart bar should show the progress from today and no previous days.

Right now its showing the time as night 12 to day 12 which is not making sense. 

Appreciate the help.