IS_VALID_DATE function

Hi,

I am using IS_VALID_DATE function to validate the date. The date input is in varchar.

When I use below validation rule its considering input value 20140550 as valid date instead of Invalid date.

(is_valid_date(to_date(Case_Valid.StatusDate,'YYYYMMDD'), 'YYYY.MM.DD') = 1)

Any idea where I am doing wrong. Appreciate your help.

Thanks,

Pandu