Change mm-dd-yyyy hh:mm:ss to mm-dd-yyyy in user prompt

Hi All,

In a Prompt I have date values as '02-12-2013 12:00:00', mm-dd-yyyy hh:mm:ss, i need to change the date to mm-dd-yyyy in the prompt.

I dont have acess to universe and i cannot achieve it in universe level, I need to do it in webi level, using R3.1, any help on this would be much appreciated, please suggest me the solution soon..

Thanks in advance.