TPlanner.DateTimeList.Clear;  //clears all datetime info from the list.
TPlanner.DateTimeList.Add(dt: TDateTime);  //adds a datetime value to the list
TPlanner.DateTimeList.Insert(Index: Integer; dt: TDateTime); // inserts a datetime value to the list
TPlanner.DateTimeList.Delete(Index: Integer);  //deletes the datetime at position Index from the list
TPlanner.DateTimeList.Items[Index]:  //TDateTime; returns the datetime values in the list

// setup of the DateTimeList
with Planner.DateTimeList do
begin
  Add(encodetime(8,0,0,0));
  Add(encodetime(9,30,0,0));
  Add(encodetime(11,00,0,0));
  Add(encodetime(12,30,0,0));
  Add(encodetime(13,30,0,0));
  Add(encodetime(14,45,0,0));
  Add(encodetime(16,00,0,0));
  Add(encodetime(17,15,0,0));
end;

// setup of the number of cells to display and cellheight
with Planner.Display do
begin
  DisplayStart := 0;
  DisplayEnd := 7;
  DisplayScale := 60;
end;

with Planner.CreateItem do
begin
  itemstarttime := encodetime(11,0,0,0);
  itemendtime := encodetime(12,30,0,0);
end;