Calculating hours and minutes between dates, and if the span of time overlaps two months

I have a query with a begin and end date parameter.  However, I find I also need to select people who have time in a house that overlaps from one month to the next.  They don't show because of the end date.

Example:  Parameters - 01/01/2013 to 01/31/2013
 Person1 - At a facility during the month
Person2 - At a facility 01/25/2013 to 02/05/2013
Person3 - At a facility 12/28/2012 to 01/04/2013

Person1 will show up, person2 won't because the end date isn't <= @enddate
Person3 won't show because of the begindate.

I also calculate how many days and hours they are at a facility.  I want to capture the overlap people and only show the days and hours for the time during the begin and end dates.  I've attached the part of my code with the calculations and selections.
SQLQuery6.sql
SherryDeveloperAsked:
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didnthaveanameConnect With a Mentor Commented:
Why don't you check to see if:

( m1.prmvt_mvmt_ts >= @beginDate or m2.prmvt_mvmt_ts <= @endDate ) and
datediff( mm, m1.prmvt_mvmt_ts, m2.prmvt_mvmt_ts ) >= 1

Edit: congrats on getting 1mil points, Paul!  I am going to hold off on the case statement until you're able to post some sample data/examples because there are a lot of different ways that can go, whereas, I think the previous was what you were looking for for that part...
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PortletPaulCommented:
sample data & expected results?
this will certainly help provide a speedy result
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SherryDeveloperAuthor Commented:
Thank you.  That was about the only one I hadn't tried.
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PortletPaulCommented:
@didnthaveaname - :) thanks, seemed like those last few points would never arrive
Cheers, Paul.
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SherryDeveloperAuthor Commented:
I'll get some posted.  I see that I'm getting most of what I want, but I'm also getting some that I shouldn't.  I'm wondering if maybe an IF statement in my where clause might work better.
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SherryDeveloperAuthor Commented:
Full Query and data results.  I removed the columns that are irrelevant.
SQLQuery1.sql
SampleData.xlsx
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didnthaveanameCommented:
I think this should do it:

   case
      when M.RELEASE_DATE > @end_Date then ( dateDiff( hour, M.confinement_date, @endDate ) / 24 )
      when M.CONFINEMENT_DATE < @begin_date then ( dateDiff( hour, @begin_date, M.release_date ) / 24 ) as TotalDays
      else null
   end as TotalDays,
   case
      when M.RELEASE_DATE > @end_Date then ( dateDiff( hour, M.confinement_date, @endDate ) % 24 )
      when M.CONFINEMENT_DATE < @begin_date then ( dateDiff( hour, @begin_date, M.release_date ) % 24 ) as TotalDays
      else null
   end as LeftOverHours,

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