Handling of date formats - d/m/Y and Y-m-d

UK dates are normally DD/MM/YYYY so I set a date value in entering the CCK to d/m/Y. However when I do a filter unless dates are entered in Y-m-d format the filtering fails.

I changed the code in the js and the module to use d/m/Y format and still the search fails.

I was thinking of checking the URL and changing the d/m/Y it to Y-m-d and sending it back to Drupal using a goto if the searching code requires it that format. Is there someway I can do that within Drupal views module itself, or some where within the Drupal despatching code?

Does the date search require dates only in Y-m-d format, or will it handle d/m/Y if properly configured??

Some help is need here.