to_char() accepting invalid dates?

Hi,

I just noticed that to_char() will "accept" invalid dates such as 2011-02-31 and "adjust" them accordingly:

postgres=> select to_date('20110231', 'yyyymmdd');  to_date
------------ 2011-03-03
(1 row)

is there a way to have to_date() raise an exception in such a case?

Regards
Thomas