YTD calculation

Anonymous 

Sample table

DAX measure

Measure YTD = CALCULATE(SUM('Table'[Sales]),DATESYTD('Table'[Date]))

YTD 2018 = 
var startDate= DATE(2018,1,1)
var lastMonthENDdate= EOMONTH(TODAY(),-1)
var endDate= SELECTEDVALUE('Table'[Date],lastMonthENDdate)
var sumVal= CALCULATE(SUM('Table'[Sales]),ALL('Table'[Date]),'Table'[Date]<= endDate&&'Table'[Date]>=startDate)
return sumVal

Output

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Anonymous 

Looks like you are trying to calculate the sales for 2018 from 1/1 till previous month-end.

I would recommend something like below.

YTD 2018_ =
VAR T =
    TODAY ()
VAR _START =
    DATE ( YEAR ( T ) - 2, 01, 01 )
VAR _END =
    DATE ( YEAR ( T ) - 2, MONTH ( T ) - 1, DAY ( T - DAY ( T ) ) )
RETURN
    CALCULATE (
        SUM ( 'Sales'[Net Sls Sd] ),
        FILTER (
            ALL ( 'My Calendar' ),
            AND ( 'My Calendar'[Date] >= _START, 'My Calendar'[Date] <= _END )
        )
    )

I haven't tested it but hope you get the idea.

If it helps, mark it as a solution

Kudos are nice too