Count Measure when decreasing date filter.

[SirBI]

I need to count current "Active Members". 

Meaning, when I slide my date filter to the right, the count should not change, they are still active members. 

But I would like to have the count change when I slide my filter to the left, counting how many active members I had during that time period. 

 Is there a measure I can write?

I  also need to indentify Public counts, I created a PK date and Public column concatendate to link to my calendar table. 

My below table:

display_name	Public	first_grant_dt	last_grant_dt	access_revoked_date	pk
Red	N	11/16/2022	11/29/2022	NULL	2022-11-16T00:00:00.0000000ZN
Blue	N	7/26/2022	9/21/2022	NULL	2022-07-26T00:00:00.0000000ZN
Green	N	10/12/2021	9/13/2022	NULL	2021-10-12T00:00:00.0000000ZN
Yellow	Y	7/1/2021	12/31/9999	NULL	2021-07-01T00:00:00.0000000ZY
Pink	Y	7/1/2021	12/31/9999	NULL	2021-07-01T00:00:00.0000000ZY

[halfglassdarkly · Accepted solution]

You'll want the date used for the slicer to be disconnected from the date fields in your table (either using an unrelated date dimension or by explicitly ignoring the slicer values in your main calculation context.

You can store the values from the slicer as variables e.g. something like:

Var MinDate = Min('Unrelated Date Table'[Date])

Var MaxDate = Max('Unrelated Date Table'[Date])

RETURN

Calculate(Count('table'[display_name]),

     ALLEXCEPT('table','table'[display_name]),

     'table'[first_grant_d]<=MaxDate && 'table'[last_grant_d]>=MinDate)