How to make formula ignore date slicers

[magnifybi]

If I change the date slicers to full year 2020, or first 6 months it works, but if I change it to July for instance, the measure goes blank, any idea why? Is it because I'm filtering out the data for it to calculate?

Quantity Last Week =

Var thisweek = WEEKNUM(today())

Var amount = calculate(Transactions[Quantity Total],vw_DateDim[WeekOfYear]=thisweek-1)

Return amount

Any way to ignore the date slicers?

[MattAllington · Accepted solution]

Your formula only changes the filter on the single [weekofyear] column while retaining any filters on every other calendar column. If you want to modify the entire cal table, you need to change the formula to first remove the filter on the entire table. 

Quantity Last Week =

Var thisweek = WEEKNUM(today())

Var amount = calculate(Transactions[Quantity Total],filter(all(vw_DateDim),vw_DateDim[WeekOfYear]=thisweek-1))

Return amount

[magnifybi]

Thanks Matt, very helpful