checking for a legal date with PL/SQL

[Quoted] [Quoted] Does anyone have a generic PL/SQL function to check if a date is legal? my website generates a 8 letter varchar in the form DDMMYYYY which i want to covert to a date using TO_DATE() but does TO_DATE know about leapyears and such?
--

                \\\|///
              \\  - -  //
               (  _at_ @  )


------------oOOo-(_)-oOOo-------------------


                            Groeten, Michiel


-----------------------Oooo-----------------


              oooO     (  )
              (  )     ) /
               \ (    (_/
                \_)