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IdHTTP.Head(URL);
ImageDate := IdHTTP.Response.LastModified;					

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procedure TForm1.Button1Click(Sender: TObject);
var zeit : tdate;
begin
idhttp1.Head(edit1.text);
zeit:=idhttp1.Response.LastModified;
label1.Caption:=datetostr(zeit);
end;					

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function TMainForm.FieldGetWebData(const URL: String): String;
var HTTP : TIdHTTP;
    Mem : TFileStream;
    S : String;
    FE : Boolean;
    D : TDateTime;
begin
    S := ApplicationDirectory+'Temp\'+ExtractFileNameFromURL(URL);
    FE := FileExists(S);
    HTTP := TIdHTTP.Create(Self);
    HTTP.Head(URL);
    D := HTTP.Response.LastModified;
    if(not FE) or ((FE) and (FileAge(S) <> DateTimeToFileDate(D)))then
    begin
    Mem := TFileStream.Create(S, fmCreate);
    HTTP.Get(URL, Mem);
    Mem.Free;
    SetFileTime(S, D);
    end;
    HTTP.Free;
    Result := S;
end;

function DTimeToFTime(dTime: TDateTime): TFileTime;
var t: Integer; ft: TFileTime;
begin
  t:=DateTimeToFileDate(dTime);
  DosDateTimeToFileTime(LongRec(t).Hi, LongRec(t).Lo, ft);
  LocalFileTimeToFileTime(ft, Result);
end;

procedure SetFileTime(FileName: String; dTime: TDateTime);
var hFile: THandle;
    Creation, LastAcces, LastWrite: TFileTime;
begin
  hFile:=CreateFile(PChar(FileName), Generic_Write, 0, nil, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0);

  Creation:=DTimeToFTime(dTime);
  LastAcces:=DTimeToFTime(dTime);
  LastWrite:=DTimeToFTime(dTime);
  Windows.SetFileTime(hFile, @Creation, @LastAcces, @LastWrite);

  CloseHandle(hFile);
end;					

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function SetFileDateTime(FileName: string; NewDateTime: TArrayDateTime; DateChanges : TDateChangeTypes): Boolean;
var
  FileHandle: Integer;
  FileTime: TFileTime;
  LFT: TFileTime;
  LST: TSystemTime;
  I : TDateChangeType;
begin
  Result := False;
  FileHandle:=-1;
  for I:= D_CREATE to D_WRITE do
  begin
  if(not (I in DateChanges))then
  Continue;
        try
          DecodeDate(NewDateTime[Ord(I)], LST.wYear, LST.wMonth, LST.wDay);
          DecodeTime(NewDateTime[Ord(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
                D_CREATE: if SetFileTime(FileHandle, @FileTime, nil, nil ) then
                      Result := Result and True;
                D_ACCESS: if SetFileTime(FileHandle, nil, @FileTime, nil ) then
                      Result := Result and True;
                D_WRITE : if SetFileTime(FileHandle, nil, nil, @FileTime ) then
                      Result := Result and True;
              end;
            end;
          end;
        finally
          FileClose(FileHandle);
        end;
   end;
end;					

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program Project1;
{$APPTYPE CONSOLE}
uses windows,sysutils;


function _setFileDate(filename : string; time:Tdatetime): boolean;
var
  hFile: tHandle;
  ttime: TFileTime;
  tsystime: TSystemTime;
begin
  hFile := FileOpen(FileName, fmOpenWrite or fmShareDenyNone);
  if hFile <> INVALID_HANDLE_VALUE then begin
    DateTimeToSystemTime(time, tsystime);
    SystemTimeToFileTime(tsystime, ttime);
    setfiletime(hFile,@ttime, @ttime, @ttime);
    FileClose(hFile);
    result := true;
  end
  else result := false;
end;


begin
   _setFileDate('C:\129.mp3', encodedate(1999,9,9));
end.					

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HTTP := TIdHTTP.Create(Self);
HTTP.Head(URL);
ShowMessage(DateTimeToStr(HTTP.Response.LastModified)); // 30.12.1899 02:00:00 immer