uses System.SysUtils, System.Classes,
  System.IOUtils;

var
  Stream: TStream;
begin
  //file size
  Stream := TFile.OpenRead('file.txt');
  WriteLn('size is ', Stream.Size);
  Stream.Free;

  //modification date
  WriteLn('modified: ', DateTimeToStr(
    TFile.GetLastWriteTime('file.txt')));

  //creation date
  WriteLn('created: ', DateTimeToStr(
    TFile.GetCreationTime('file.txt')));
end.