Variable 'OldTime' is declared but never used in 'TForm1.FormCreate'

Variable 'OldTime' is declared but never used in 'TForm1.FormCreate'
啥意思啊？procedure TForm1.FormCreate(Sender: TObject);
 var
       I,   J:   Integer;
       MaxRow,   MaxCol:   Integer;
       List,   Strs:   TStringList;
       ExcelApp,   Sheet:   Variant;
       OldTime:   TDateTime;
begin
       List   :=   TStringList.Create;
       Strs   :=   TStringList.Create;
       //   创建一个excel的ole对象
       ExcelApp   :=   CreateOleObject( 'Excel.Application ');
       try
          //   打开一个excel文件
             ExcelApp.WorkBooks.Open(RzEdit1.Text);
             List.BeginUpdate;
             try
                   //   设置工作区
                   ExcelApp.WorkSheets[1].Activate; 
                   Sheet   :=   ExcelApp.WorkSheets[1]; 
                   //   有数据的区域的行数和列数
                   MaxRow   :=   Sheet.UsedRange.Rows.count   -   1; 
                   MaxCol   :=   Sheet.UsedRange.Columns.count; 
                   for   I   :=   2   to   MaxRow   do
                   begin 
                         Strs.Clear; 
                         for   J   :=   1   to   MaxCol   do 
                         begin 
                               //   获得excel的数据第i行，第j列单元格内的数据
                               Strs.Add(Sheet.Cells[i,   j].Value); 
                         end; 
                         List.Add(Strs.CommaText); 
                   end; 
             finally 
                   //   关闭工作区    
                   ExcelApp.WorkBooks.Close; 
                   List.EndUpdate; 
             end; 
       finally 
             //   释放ole对象 
             ExcelApp.Quit; 
             List.Free; 
             Strs.Free; 
       end; 
end;