I just tried this. I am not sure if it is what your looking for but it may be a start in the right direction
select to_date('020202', 'YYMMDD') from dual;
to use to_date you give it the date string that you are receiving and also the format that the date string is in. In my case I was giving it Year month day so the format was 'YYMMDD'
You can try to toss that into your insert and see what happens
Don't be afraid to try something new. Amateurs built the Ark, professionals built the Titanic