Which function in DAX returns the same expression evaluated over the previous year?

Question

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Which function in DAX returns the same expression evaluated over the previous year?

Accepted Answer

To evaluate an expression over the previous year, the SAMEPERIODLASTYEAR function is used. This function returns the same expression evaluated at the same time period in the previous year. The DATEADD and PARALLELPERIOD functions modify dates, while PREVIOUSYEAR only returns the previous year's date.