How to change DOS Files Date Time Stamp

procedure TForm1.Button1Click(Sender: TObject);
var
  OutFile: file;
  OutFileName: string;
  FileDateTime: TDateTime;
begin
  //File which date & time stamp are to change...
  OutFileName := 'c:\Test.txt';
  AssignFile(OutFile, OutFileName);
  Reset(OutFile);
  //Get file's current date & time stamp...
  FileDateTime := FileDateToDateTime(FileAge(OutFileName));
  //Set file's date one day ahead!
  FileSetDate(TFileRec(OutFile).Handle, DateTimeToFileDate(FileDateTime + 1));
end;