How to return values based on if dates are within Slicer date range

Hello all :)

My user story: I would like to return values based on the following (in DAX)--> 

1. If the "dates.start" (a date I get from a query called "Tasks") is earlier than the right date on my date slicer AND
2. If the "dates.due" (also from the same query) is after the left date on my data slicer

THEN --> return 0 else 1.

When I say "date slicer" I am refering to the visualization:

The field I am using for the data slicer comes from a separate calendar table ("CalendarTable") I created within PowerBI.

The formula I thought would work to meet the goals in the story above is:

CalculatedColumn = IF(AND(Tasks[dates.due]>FIRSTDATE(CalendarTable[Date]), Tasks[dates.start]<LASTDATE(CalendarTable[Date])), 0, 1)

The result with this code is that no matter how I set my date slicer, it always returns 0.

Thank you,

-L