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Examples of date calculations are in the The specified item was not found. and Workbook & Calculation Library and then there is a great Think Data Thursday presentation from Rody Zakovich called Think Data Thursday: Dating Rody that you may also find helpful.
If there is not a solution to be found in those resources, please come back here and post a Tableau Packaged workbook showing an example of the data and visualization that you are trying to create. The answers for this may be different depending on the type of visualization being created and what you are trying to convey. Please be sure to include a Tableau Version number with your .TWBX file.
Thanks Patrick, I was able to figure it out using a a few IF statements.