Date difference between 2 previous months

[kav_cris]

Hi all,

I am trying to calculate the storage time (in days) for unsold items, historically.

Let's say I bought product A in Jan 2022 and it is still stored today.

DATEDIFF(Sales[PurchaseDate], TODAY(), DAY),) gives me the storage time in days up until today.

I want a bar chart that shows storage time in Feb 2022, March 2022, ... Feb 2023.

I tried replacing TODAY() with MAX(Date[Date]) or SELECTEDVALUE(Date[Date]) with no success. 

P.S. Sales table only has PurchaseDate adn SoldDate as date columns.

[kav_cris]

Some more info, my measure looks like this:

Datediff =

CALCULATE(
if(
    SELECTEDVALUE('Date'[MonthEndDate]) >= SELECTEDVALUE(Sales[PurchasedDate]) ,
    DATEDIFF(SELECTEDVALUE(Sales[PurchasedDate]), SELECTEDVALUE('Date'[MonthEndDate]) , DAY),
    "f"
), USERELATIONSHIP(Sales[PurchasedDate], 'Date'[Date]))

And I get this result:

It only calculates the datediff to the month itself. 
I want the difference to all following month ends.

[FreemanZ]

hi @kav_cris 

try to provide sample dataset with expected result.