How to select dates between START_DATE and END_DATE fields with one Date Picker

[megasupermoon]

Hello,

I have Pivot Table that have medication information with PATIENT_ID, START_DATE, MEDICINE_NAME,  MEDICINE_POTENCY and EXPIRATION_DATE.  There's also Date Picker, and when the user selects date range,  the report should show only those medications that  are valid within selected date range. For now Date Picker gives medications  whose START_DATE is within selected date range, regardless of whether the medications have expired or still valid. 

How to make the report and Date Picker work as desired or is it even possible? Is this done with code/query or in the report side?

Thanks for advance!

[Chanty4u · Accepted solution]

Try this 

SUM({$<START_DATE = {"<=$(=Max({1} START_DATE))"}, EXPIRATION_DATE = {">=$(=vSelectedDate)"}>} MEDICINE_POTENCY)