Date input for Dahsboard not working

Hi,

I am building a dash board with Date as filter, in query browser I connect to universe and build query selecting dimension, measure with Date as filter (Equal to "Prompt"), Prompt I have deselected all options.  I bound a Cell in excel as input, another cell for date, measure for output.

I used excel formula Today()-1 as input filed.

When use formula its not fetching any data but if I hard code date its fetching data, I understand that formula/prompt isn't working.

Could any one help me on this.

Thanks

Nick