DateDiff until end of month

Hi guys, 

I'm working on a table with several columns: date, product and status. Each product can have several statuses (working, not working). I'm looking to calculate how long each product stayed in a certain status. For this I have a measure that calculates for each product How long has it been until the next time it changes status and so on.

BUT I have a problem the result obtained does not reflect reality. 

if for example a product A was "working" from 01/01/2021 until 01/05/2021 (4 days difference) in this date it will "Not working". 
but the 02/05/2021 it will be "working" so my measure says me that passed from here 30 days. But actually that is not true. Because if I want to display for the January month how many days was the product "not working" so I'll get the result 30 ! But the reality is that in January the product was 25 days in this status and not 30, the five days have to be in the next month ! 

Actually dax have to understand that he have to stop the sum of days at the end of month if not I'lol get fake data with slicers. 
do you have a solution ?