Custom Report for upcoming due dates

Custom Report for upcoming due dates

I am wanting to run a custom report on a regular basis that lists the tickets that have due dates within a specified number of days.  For example, the open tickets due within the next 3 days.  I can do this if I create a custom report and then manually adjust the dates.  Is there a way for it to calculate the dates or pick an option of DueByTime less than x days?  I couldn't find one and looking at the queries for other reports, not sure how to designate that in a query.

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