To reproduce: Appointment app = new Appointment(DateTime.Today.AddHours(18), TimeSpan.FromHours(10), "Test"); this.radScheduler1.Appointments.Add(app); SchedulerDayView dayView = this.radScheduler1.GetDayView(); dayView.RulerStartScale = 1; dayView.RulerEndScale = 24; dayView.DayCount = 2; this.radScheduler1.EnableExactTimeRendering = true;