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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/
I am not aware of anything special that you do to mark a date table in Power BI Desktop.