In the attached workbook I want show YoY growth. Right now I am using a tableau calculation to do that. However, for the latest year I want to compare up to the same period last year not the full year . For example, in 2018 I have data from Aug 2017 to Jul 2018 wk-2 . So for this year I want calculate growth by comparing sales of Aug-2016 to Jul 2017 wk-2. The difficulty here is I don't have a proper date field but do I have week ID column (yyyymmwk) that identifies a week in the month.