Date Variable in Set Analysis

[robinsond31]

I have a date field called DateOrdPlaced. I have a variable called vReportDate. It looks like this:  10/31/18. I want to report on all records that have a DateOrdPlaced within the last 30 days of the vReportDate. That is vReportDate -30. Starting with this formula, how can I obtain that?

Does someone have an article or white paper on using date variables in set analysis?

Sum({$<DateOrdPlaced={">$(vReportDate)-30"}>} AmtTotLine)

[Gysbert_Wassenaar]

Try Sum({$<DateOrdPlaced={">$(=Date#($(vReportDate),'MM/DD/YY')-30)"}>} AmtTotLine)