DAX - Get the date difference in days from the slicer in Power BI

Hi All, 

 To get the date difference in days from the slicer in Power BI, follow below code

DAYSSELECTED =

VAR FirstDay = CALCULATE(

MIN('D_SALES_STATE_HIST'[DT_DOCUMENT]),

ALLSELECTED('D_SALES_STATE_HIST'[DT_DOCUMENT])

)

VAR LastDay = CALCULATE(

MAX('D_SALES_STATE_HIST'[DT_DOCUMENT]),

ALLSELECTED('D_SALES_STATE_HIST'[DT_DOCUMENT])

)

RETURN

DATEDIFF (FirstDay,LastDay,DAY)