Load date in 'MM/DD/YYYY' format by SQL*LOADER

I have a data file that date in 'MM/DD/YYYY' such as '10/11/2000'. I am trying to use sql loader to load the file into table. I wrote the control file including:
AVAILABILITY_DT DATE NULLIF AVAILABILITY_DT="00000000" However, oracle can not take it. I did try to chang control to : AVAILABILITY_DT DATE 'MM/DD/YYYY' NULLIF AVAILABILITY_DT="00000000" It dosen't work either.

So how can I modify the control file in order to take the date like 'MM/DD/YYYY' ?
Please help. Received on Mon Oct 16 2000 - 18:02:07 CDT