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How to mark Date table?
How do we mark a Date table as such in Power BI Desktop so that DAX date formulas, such as TOTALYTD, work?
You can also use PowerQuery itself to create a date table. Matt Mason has a great post on this here - http://www.mattmasson.com/2014/02/creating-a-date-dimension-with-a-power-query-script/
We do not have Calculated Tables or Date Tables in the PBI Desktop yet... Proper date time support with ability to use DAX time functions is one of the key scenarios that we are working on. We should improve in this area in the next couple months.
Alex.