Using calculation groups or many to many relationships for time intelligence selection

Compare two common techniques to filter time periods in DAX: calculation groups and many-to-many relationships. Article and download: https://sql.bi/786473?aff=yt How to learn DAX: https://www.sqlbi.com/guides/dax/?aff=yt The definitive guide to DAX: https://www.sqlbi.com/books/the-definitive-guide-to-dax-2nd-edition/?aff=yt