How to Calculate the Time Lapsed Between Two Dates & Times?

I haven’t tested this at all, but something like this seems like what you’re looking for.

TIME:Tick   EQUATE(  1)
TIME:Second EQUATE(100 * TIME:Tick)
TIME:Minute EQUATE( 60 * TIME:Second)
TIME:Hour   EQUATE( 60 * TIME:Minute)
TIME:Day    EQUATE( 24 * TIME:Hour  )

Dates.Span PROCEDURE(LONG xDateA, LONG xTimeA, LONG xDateB, LONG xTimeB, *LONG xOutSpanDays, *LONG xOutSpanTime)
FirstDate  LONG,AUTO 
FirstTime  LONG,AUTO 
SecondDate LONG,AUTO 
SecondTime LONG,AUTO 

    CODE 
    IF (xDateA < xDateB) OR (xDateA = xDateB AND xTimeA < xTimeB)
       FirstDate  = xDateA 
       FirstTime  = xTimeA 
       SecondDate = xDateB
       SecondTime = xTimeB
    ELSE 
       FirstDate  = xDateB 
       FirstTime  = xTimeB 
       SecondDate = xDateA
       SecondTime = xTimeA
    END 

    xOutSpanDays = SecondDate - FirstDate 

    IF FirstTime <= SecondTime 
       xOutSpanTime = SecondTime - FirstTime 
    ELSE 
       xOutSpanDays -= 1
       xOutSpanTime  =  FirstTime - ( SecondTime - TIME:Day )
    END
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