Dax Query to get data opened before this month

[FaisalImam]

Hi Team, 

I  need to show the count of tickets  that were opened  before this month and  are resolved or still open in the present month..

I have written a Measure but getting wrong count : 

backlog  = CALCULATE(COUNT(Incident[NUMBER]),FILTER(Incident,Incident[OPENED].[MonthNo] < MONTH(TODAY())),FILTER(Incident,Incident[RESOLVED].[MonthNo] = MONTH(TODAY()) || BLANK()))

I am getting wrong count because when filtering { month no < month(today)  , it excludes  tickets that are opened in month - (7-12) of previous years.. i need to include that. 

Please modify the query in best possible way

[amitchandak]

@FaisalImam , A measure like

backlog = CALCULATE(COUNT(Incident[NUMBER]),FILTER(Incident,eomonth(Incident[OPENED],0) <= eomonth(Today(),-1)
&& (isblank(Incident[RESOLVED]) || eomonth(Incident[RESOLVED],0) > eomonth(Today(),-1) )) )

Also, refer

https://community.powerbi.com/t5/Community-Blog/HR-Analytics-Active-Employee-Hire-and-Termination-tr...

[FaisalImam]

Thank you somuch sir @amitchandak . 

logic worked perfectly. Can you explain " eomonth(Incident[OPENED],0) <= eomonth(Today(),-1"