This article covers how simple it is to create a calendar table in Power Pivot.
Adding a Calendar Table in Power Pivot
In the Power Pivot Data Model > Design > Date Table > New
It adds a table in the data model (table name: Calendar):
The first column in the table Date is equivalent to the CALENDARAUTO function. The values of this column change according to the date columns in the data model. It considers all the date columns present in the model and creates the range of dates in the column.
The rest of the columns in the table are calculated columns. We can modify them as per our requirement.
Changed the formula for the Month column
Connecting with the fact tables
Switch to the Diagram view
And establish the relationship with the relevant data tables
And we are all set to write measures for data modeling
Related article: Multiple dates on same axis - DAX USERELATIONSHIP