Determine if valid date via SQL

Hi folks,

I'm trying to find the equivalent of IS_DATE function to determine if a field contains a valid date in SQL select statement;

ie: something like this

select

CASE WHEN IS_DATE(TO_CHAR(BLDAT, 'MM/DD/YYYY')) = 'Y'

THEN

<DO SOMETHING>

ELSE

<DO SOMETHING ELSE>

END As DateCheck

etc.....

Except IS_DATE is not a valid function in HANA.  Anybody know another way to do this?

Thanks,

-Patrick