FarPoint.Win.Spread.CellType.DateTimeCellType dt = new FarPoint.Win.Spread.CellType.DateTimeCellType();
dt.CalendarDayBackColor = Color.Aqua;
dt.CalendarDayFont = new Font("MS Sans Serif", 6);
dt.CalendarDayForeColor = Color.Blue;
dt.CalendarMonthBackColor = Color.Coral
dt.CalendarMonthFont = new Font("MS Sans Serif", 12);
dt.CalendarMonthForeColor = Color.Bisque;
dt.CalendarMonthHeaderDock = PluginCalendar.WinForms.HeaderDock.Right;
dt.CalendarMonthHeaderHeight = 10;
dt.CalendarMonthHeaderStyle = PluginCalendar.WinForms.HeaderStyle.Scroll;
dt.CalendarShowSurroundingDays = true;
dt.CalendarSingleLineHeader = PluginCalendar.WinForms.SingleLineHeader.MonthFirstBottom;
dt.CalendarSurroundingDaysColor = Color.AliceBlue;
dt.CalendarWeekdayBackColor = Color.Beige;
dt.CalendarWeekdayFont = new Font("MS Sans Serif", 12);
dt.CalendarWeekdayForeColor = Color.BlueViolet;
dt.CalendarWeekdayHeaderDock = PluginCalendar.WinForms.WeekdayDock.Top;
dt.CalendarWeekdayHeaderHeight = 20;
dt.CalendarYearBackColor = Color.BlanchedAlmond;
dt.CalendarYearFont = new Font("MS Sans Serif", 12);
dt.CalendarYearForeColor = Color.CadetBlue;
dt.CalendarYearHeaderDock = PluginCalendar.WinForms.HeaderDock.Left;
dt.CalendarYearHeaderHeight = 15;
dt.CalendarYearHeaderStyle = PluginCalendar.WinForms.HeaderStyle.Scroll;
fpSpread1.ActiveSheet.Cells[0, 0].CellType = dt;
fpSpread1.ActiveSheet.Cells[0, 0].Value = Now;