How can I filter a view based on an inserted XSL formula from sharepoint designer 2010?
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First of all, thanks for trying to help!

I've been searching the internet for quite some time with no luck so far. I am creating a dashboard site and trying to get around the limitations of the Today() trick. My end goal is to have a column's value set by a XSL formula and grouped by the result in a view on SharePoint. 

I currently have a column that returns the days left (-18,0,3,etc) by means of this formula:

    number(ddwrt:FormatDateTime(ddwrt:FormatDate(string($thisNode/@Due_x0020_Date),1033,1),1033,'>yyyyMMdd'))-number(ddwrt:FormatDateTime(ddwrt:FormatDate(string(ddwrt:Today()),1033,1),1033,'yyyyMMdd'))

But when I try to filter a view by that column > 0 then I get nothing. I set a calculated column to equal just to see what was given and each row was returning 0. Is there any way to set the result of the formula to the value? Im fairly new to XSL so sorry if I missed an option, but I'm going to loose some serious hair over this.

 Let me know if there is anything else I can provide that would help.