Dax Measure with dynamic date

[Anonymous]

I need help. 

I am trying to create a measure that counts the # of items ordered since an account was created. I manually keyed 01/01/2022 in the measure below and was able to get the result I expected. 

COUNTROWS(

        GROUPBY(FILTER(Table,Table[First Sample Date]>= DATE(2022,01,01)),Table[Sample ID],Table[Order Choice Type])

)

Unfortunately, I can't figure out how to update the syntax in the measure to dynamically display correctly based on the minimum date in the visual or a slicer.  

COUNTROWS(

        GROUPBY(FILTER(Table,Table[First Sample Date]>= CALCULATE(min('Calendar'[DATE]),ALLSELECTED('Calendar'[DATE])),Table[Sample ID],Table[Order Choice Type])

)

Below are screenshots of the baseline (with the expected values) as well as the incorrect values based on my failed attempt. 

Any help is appreciated!

[amitchandak · Accepted solution]

@Anonymous , Try like

New=
var _min = minx(allselected('Calendar') ,'Calendar'[DATE])
return

calculate(COUNTROWS(Summarize(Table, Table[Sample ID],Table[Order Choice Type])),FILTER(Table,Table[First Sample Date]>= _min)
)

or

New=
var _min = minx(allselected('Calendar') ,'Calendar'[DATE])
return

calculate(COUNTROWS(Summarize(Table, Table[Sample ID],Table[Order Choice Type])),FILTER(all(Table),Table[First Sample Date]>= _min)
)