DAX to get number of nights per month between 2 dates

[manup07]

CONTEXT:

I have a table with different room transactions(reservations), I'm trying to calculate the number of nights between two dates so I can usem them in a pivot table or any graph, like this:

This result is not correct because I should have in december(diciembre) 8 instead of 9 and that 1 remaning should go to january, and so on. 

QUESTION:

How to create a DAX or how to solve this issue.

[Jihwan_Kim · Accepted solution]

Hi, I am not sure how your semantic model looks like, but I tried to create a sample pbix file like below.

Please check the below picture and the attached pbix file whether it suits your requirement.

expected result measure: =
VAR _currentmonth =
    MAX ( 'Calendar'[Year-Month sort] )
VAR _t =
    GENERATE (
        Data,
        FILTER (
            'Calendar',
            'Calendar'[Date] > Data[Start]
                && 'Calendar'[Date] <= Data[End]
        )
    )
RETURN
    COUNTROWS ( FILTER ( _t, 'Calendar'[Year-Month sort] = _currentmonth ) )

[manup07]

I think it works, but before I marked it as a solution, I need to know if this will work with other visuals, for example a line chart, or to create other measures with it

[Jihwan_Kim]

Hi, thank you for your message, and please provide your sample pbix file and then I can try to look into it.

Thanks.

[manup07]

No worries, your answer work wonders, thank you so much @Jihwan_Kim