Calculate Days Until Date+3 Years

Hello,

I am trying to calculate how many days until a certain date, provided date+3 years within a formula.  All I want to do, for example, is show how many days it is until expiration, given expiration is 3 years after the provided date, but I can't quite figure out how to do this.  I know Sisense and date functions are like oil and water for some reason but this isn't that difficult of a calculation.  I should also mention, editing the underlying data source or elasticube (live model in this case) is not (nor should it have to be with a BI tool) an option.  Scripting would be a last resort but not off the table.  Any help would be greatly appreciated!

Logically it would be something like this, but of course this doesn't work (not worried about leap years so 365*3=1095 to simplify)

DDiff(NOW(),[MyDate]+1095)

 A very simple Excel formula for reference as well:

DATEDIF(TODAY(),EDATE(A2,36),"d")