Time intelligence function working for leap year or not

Hi tomas12344, the best solution is to test it out 🙂

As you can see from the example below, SAMEPERIODLASTYEAR() considers leap year:

I always suggest to have a tehcnical measures that are showing you what period is actually selected (which might be different from what one expects 😉 )

Here is a code of the measure for this test:

Same Period Last Year = 
VAR _SamePeriodLastYear = SAMEPERIODLASTYEAR( c_Calendar[Date] )
VAR _MinDate = MINX( _SamePeriodLastYear, [Date] )
VAR _MaxDate = MAXX( _SamePeriodLastYear, [Date] )
VAR _Result = 
    IF(
        _MaxDate <> _MinDate,
        "Currently Selected Same Period Last Year: " & _MinDate & " - " & _MaxDate,
        "Currently Selected Same Period Last Year: " & _MinDate
    )
    
RETURN
    _Result

Good luck with your task!