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type 
  TArrayDateTime = array[0..2] of TDateTime;

const 
  ArrayDateTime : TArrayDateTime = 
                               ( 36000,   {Erstellt}
                                 36000,   {Letzter Zugriff}
                                 36000 ); {Geändert am}

function SetFileDateTime(FileName: string; NewDateTime: TArrayDateTime): Boolean;
var
  FileHandle: Integer;
  FileTime: TFileTime;
  LFT: TFileTime;
  LST: TSystemTime;
  i: integer;
begin
  Result := False;
  FileHandle:=-1;
  for i:=0 to 2 do
   Begin;
        try
          DecodeDate(NewDateTime[i], LST.wYear, LST.wMonth, LST.wDay);
          DecodeTime(NewDateTime[i], LST.wHour, LST.wMinute,  LST.wSecond, LST.wMilliSeconds);
          if SystemTimeToFileTime(LST, LFT) then
          begin
            if LocalFileTimeToFileTime(LFT, FileTime) then
            begin
              FileHandle := FileOpen(FileName, fmOpenReadWrite or
                fmShareExclusive);
              case i of
                0: if SetFileTime(FileHandle, @FileTime, nil, nil ) then
                      Result := Result and True;
                1: if SetFileTime(FileHandle, nil, @FileTime, nil ) then
                      Result := Result and True;
                2: if SetFileTime(FileHandle, nil, nil, @FileTime ) then
                      Result := Result and True;
              end;
            end;
          end;
        finally
          FileClose(FileHandle);
        end;
   End;
end;


prcocedure run;
Begin;
  if SetFileDateTime('C:\config.sys',ArrayDateTime) then 
   Label1.Caption:='Dateidatum wurde geändert.'
End;