Same Period Last Year

Anonymous , Try one of the 2. Make sure the date table is marked as a date table

_Measure =
CALCULATE(
CONCATENATEX (
VALUES(Dates[Date]),
Dates[Date],
UNICHAR(10)
),
dateadd(Dates[Date],-1, year)
)

or

_Measure =
CALCULATE(
CONCATENATEX (
VALUES(Dates[Date]),
Dates[Date],
UNICHAR(10)
),
datesmtd(dateadd(Dates[Date],-1, year))
)

Also refer this formula, You can embed you formula with filter of date , just an example. check how date filter of today -1 year is forced

LYMTD QTY forced=
var _max = date(year(today())-1,month(today()),day(today()))
return
if(max('Date'[Date])<=_max, CALCULATE(Sum('order'[Qty]),DATESMTD(dateadd('Date'[Date],-1,year)),'Date'[Date]<=_max), blank())
//OR
//CALCULATE(Sum('order'[Qty]),DATESMTD(dateadd('Date'[Date],-1,year)),'Date'[Date]<=_max)
//TOTALMTD(Sum('order'[Qty]),dateadd('Date'[Date],-1,year),'Date'[Date]<=_max)