Calendar not showing correct times for one day

I created a calendar that my company will use for our booth at an upcoming conference. The first day of the show, the booth is only open from 4 p.m. - 6 p.m., but not matter what I do, the time displayed when you select a service on that first day is from 8 a.m. - 6 a.m. Does anyone know what I am doing wrong? It makes absolutely know sense.