Variance for Workday Last Month

[KillerJ1]

Hey Everyone,

I am trying to get an order count variance based on the working day last month. Here is an example of the data I would like to see. 

Date	/Working day	/Count	/Previous month workday count	/difference
08/19/21	14	105	305	-200
07/21/21	14	305	205	100
06/18/21	14	205	Blank() if no data	Blank() if no data
08/18/21	13	150	450	-300
07/20/21	13	450	300	150
06/17/21	13	300	Blank() if no data	Blank() if no data

I have tried so much and just can't seem to get the data to look like this. If you have a measure to grab the last months working day order count that would be amazing if you can share it. Thats the hardest part for me. Thanks! 

[amitchandak]

@KillerJ1 , You need to have workday column in your date table

WorkDay = if(WEEKDAY([Date],2)>=6,0,1)

measure =
var _max = maxx(filter(all('Date'), Date[Workday] =1 && eomonth(Date[Date],0) = eomonth(max(Date[Date]),-1) ),[Date])
return
calculate(Sum(Table[Value]), filter(all('Date'), Date[Date] =_max)) - Sum(Table[Value])