The control exposes a 'GetDayFromPoint' method, which you can use to hit test for a given date. When the user clicks on a DayUIElement (assuming the control/shift keys are not pressed, in which case the selection is extended), the UltraMonthViewSingle.CalendarInfo.ActiveDay changes; it also changes when the end user navigates via the arrow keys (again assuming that no modifier keys are pressed. (The ActiveDay is depicted visually with a focus rectangle, in case you were not familiar with this WinSchedule concept.)