Optimized Calculation Algorithm for Business Days

alter procedure SpBusinessDays (@dtStartDate datetime, @dtEndDate datetime,
@indDaysInWeek int)
as
begin
/*
Description:
   Function designed to calculate the number of business days 
between two dates.
*/
declare 
	@intWeeks int
	,@indDays int 
	,@intSdays int
	,@intEdays int


	-- Find the number of weeks between the dates. Subtract 1 
	-- since we do not want to count the current week.
	select @intWeeks = datediff( week, @dtStartDate, @dtEndDate) - 1
	print 'week'
	print @intWeeks

	-- calculate the number of days in these compelete week.
	select @indDays = @intWeeks * @indDaysInWeek
	print 'Est. Days'
	print @indDays

	-- Get the number of days in the starting week. 	
	if @indDaysInWeek = 5
	   -- If Saturday, Sunday is holiday
	   if datepart( dw, @dtStartDate) = 7
		select @intSdays = 7 - datepart( dw, @dtStartDate)
	   else
		select @intSdays = 7 - datepart( dw, @dtStartDate) - 1
	else
	-- If Sunday is only Holiday
	   select @intSdays = 7 - datepart( dw, @dtStartDate) 

	print 'Starting Days'
	print @intSdays
	-- Calculate the days in the last week. These are not included in the
	-- week calculation. Since we are starting with the end date, we only
	-- remove the Sunday (datepart=1) from the number of days. If the end
	-- date is Saturday, correct for this.

	if @indDaysInWeek = 5
		if datepart( dw, @dtEndDate) = 7
			select @intEdays = datepart( dw, @dtEndDate) - 2
		else
			select @intEdays = datepart( dw, @dtEndDate) - 1
	else
        	select @intEdays = datepart( dw, @dtEndDate) - 1
	print 'End Days'	
	print @intEdays
	-- Sum everything together.
	select @indDays = @indDays + @intSdays + @intEdays

	if datepart( dw, @dtStartDate) <> 7 and @indDaysInWeek = 5
	  select @indDays = @indDays + 1
	print 'Ans'
	print  @indDays

end

-- exec SpBusinessDays '05/15/2005','05/21/2005',6

/*
  exec SpBusinessDays '05/13/2005','05/23/2005',5
  select datepart( dw, '05/13/2005')
  select datediff( mm, '05/18/2005', '05/31/2006')
*/