Advanced Search > Using date functions (e.g., past 30 days)

I hope this makes sense, but I'd love to be able to create (and save) an advanced search using date ranges that vary based on the current date. For example, a search that shows new cases opened in the last 30 days, 60 days, etc (instead of having to use a static date range).

Now that we can use these saved searches as tiles on the dashboard, having the ability to use a revolving date range like this would be extremely useful.