TidHTTP and date

Hi

I'm trying to get the www page from the net but there is an exception raised

It says:

---------------------------
Debugger Exception Notification
---------------------------
Project Project1.exe raised exception class EConvertError with message
'Invalid argument to date encode'. Process stopped. Use Step or Run to
continue.
---------------------------
OK   Help
---------------------------

I don't know what to do I try to set the IdHTTP1.Request.ExtraHeaders.Date
:= Date; but this is not helping

What can I do to avoid this exception?

best regards
Mateusz [PEYN] Adamus