We need a dynamic method by which we can change date level. From years to months, from months to weeks or from weeks to days. We need a quick method that allows us to change date level depending on the level of data we want to analyze. The ability to create a parameter in Tableau that allows us to change date level is one of the most dynamic options to compare performance at level of weeks, days, months, etc. Second, it offers more flexibility to end user in terms of date granularity and the time on which it will explore his data.