MTD and MTD LY against selected week value from drop down

[M22]

I am trying to get the MTD last year against week 

i have Week End dates in my Drop down (single selection )

i am calculatin MTD using following dask which is returning correct values (2 week of Mar-23)

MTD UNITS = TOTALMTD(sum('Table A'[Value Sales per Week]),'Table A'[Week End Date])

What will be the MTD last Year againt single selection drop down i tried many dax which are available online but they give me wrong answers. for exp i am selecting 2 weeks of 23 the result should b first 2 week of mar 22.

[M22 · Accepted solution]

Well i am done with DAX finally

MTD1 LY =

VAR CurrentMonth =

    MAX ( 'date[Date])

VAR LastYear =

    YEAR ( CurrentMonth ) - 1

VAR days = DAY(MAX('date[Date])+1)

VAR LastYearStartDate =

    DATE ( LastYear, MONTH ( CurrentMonth ), 1 )

VAR LastYearEndDate =

   DATE ( LastYear, MONTH ( CurrentMonth ), days )

VAR LastYearMTDStartDate =

    IF ( LastYearStartDate > DATE ( LastYear, 1, 1 ), LastYearStartDate, DATE ( LastYear - 1, 12, 1 ) )

RETURN

 CALCULATE (

        SUM('[ Value Sales]),

        DATESBETWEEN ( 'date[Date], LastYearMTDStartDate, LastYearEndDate )

    )