Often in your analysis, you will want to understand when something happened. You'll ask questions like these:
Fortunately, Tableau makes this kind of visual discovery and analysis easy.
When you are connected to a flat file, relational, or extracted data source, Tableau provides a robust built-in date hierarchy for any date field.
Cubes/OLAP connections do not allow Tableau hierarchies. You will want to ensure that all date hierarchies and date values you need are defined in the cube.
To see this in action, continue with the visualization workbook ...