Needed a FM

Hi,

I had a requirement to check date format of a date field..i need to convert that into standard format.

ex: 11/11/2005(MM/DD/YYYY) to 20051111 (yyyymmdd).

i got a FM DATE_CONV_EXT_TO_INT.

It's working fine with MM/DD/YYYY.

But if i change user format to MM-DD-YYYY ..it's not working.

Can any body suggest me the right FM to use which works for all Instances of formats.

Thanks in adv.