What do you mean it doesn't show them? Maybe you need to scroll your window to the right to see the whole diagram.
I see a section of the Gantt chart labeled Sat May 12 in my earlier screenshot. Below, I've put in a task starting at 10 AM (within the 9 AM - 3 PM block I added to Sat May 12) and changed the view a bit.
I've attached the file to this post.