Customizing the Pop-up Calendar
If you press F4 or double-click a date cell when it is in edit mode, a pop-up calendar appears. The date you choose from the calendar is placed in the date cell.
You can specify short day names, long day names, short month names, and long month names to appear in the calendar for all fpSpread controls in your project or for individual fpSpread controls. You can also specify the text that displays for the OK and Cancel buttons.