How to calculate the dates since last incident between two departments as DAX Measure

I came across a situation where i have to indicate the number of days since last incident retrospectively what department they report to. To overcome this challenge i wrote below dax commands to grab any incident on or before the maximum selected date period in the parameter section.

Below is the code i developed and i have provided the comments in each section why i do it. Hope you will read this easily.

M_Total_Days_Since_LastIncident =

VAR maxDate =

MAX ( dimDate[FullDate] ) -- Maximum date selected in parameter date range

VAR maxDEP1 =

CALCULATE (

MAX ( FactDep1Event[EventDateKey] ),

FILTER ( ALL ( dimDate ), dimDate[FullDate] <= maxDate )

) -- Last event datekey for Dep1 on or before maximum date selected

VAR maxDEP1Date =

CALCULATE (

MAX ( dimDate[FullDate] ),

FILTER ( ALL ( dimdate ), dimDate[DateKey] = maxDEP1 )

) -- Find the date associated with dep1

VAR maxDEP2 =

CALCULATE (

MAX ( FactDEP2Event[EventDateKey] ),

FILTER ( ALL ( dimDate ), dimDate[FullDate] <= maxDate )

) -- Last event datekey for Dep2 on or before maximum date selected

VAR maxDep2Date =

CALCULATE (

MAX ( dimDate[FullDate] ),

FILTER ( ALL ( dimdate ), dimDate[DateKey] = maxDEP2 )

) -- Find the date associated with dep2

RETURN

IF (

ISBLANK ( maxDEP1Date ) && ISBLANK ( maxDep2Date ),

"-",

IF (

maxDEP1Date >= maxDep2Date ,

DATEDIFF ( maxDEP1Date , maxDate, DAY ) + 0,

DATEDIFF ( maxDep2Date , maxDate, DAY ) + 0

)

)-- Compare which date is closer to maximum date and display