I need help, CFquery and SQL NOT BETWEEN

OK I am building a hotel booking system as a college project and I'm having trouble with finding rooms that are available. Now I have got this working, to an extent, So to give you the bigger picture al try and lay this out the best I can so you can understand.
This is my database structure:
Bookings Table
Rooms Table
Customers Table
BookingID
BookingDateIN
BookingDateOUT
RoomID
CustomerID
RoomID
RoomType
RoomNumber
RoomPrice
Room Description
CustomerID
FullName
AddressLine1
AddressLine2
PostalCode
CarReg
OK, now you can see how this is going to work with the Bookings Tables RoomID and CustomerID matching the others to make a relationship, simple databasing.
Now I have a page that lets you select a date and then select how many days the customer wants to stay for. So the selected date will be put towards the BookingDateIN field and the calculated date will be put towards the BookingDateOUT in a NOT BETWEEN SQL statement.
I have got this to work with some test data, how ever when I select a date range that is below the 5th day in any month it shows the rooms are booked and not available even though the test data does not contain any days below the 5th.
This is my test data in the Bookings Table:
BookingID
BookingDateIN
BookingDateOUT
CustomerID
RoomID
1
20/05/2010
23/05/2010
2
2
2
26/05/2010
28/05/2010
1
5
And here is my code for the bookings page:
<cfset CurrentPage=GetFileFromPath(GetBaseTemplatePath())>
<cfif isDefined("FORM.SearchRooms")>

<cfset #CalDate# = #DateFormat( DateAdd( 'd', #FORM.SelDays#, #FORM.SelDate# ), 'dd/mm/yyyy' )#>

<cfquery name="Check_Rooms_RS" datasource="HotelBookingSystem" username="HBSuser" password="HBSpass">
    SELECT *
    FROM Bookings
    WHERE BookingDateIN AND
    BookingDateOUT NOT BETWEEN
    <cfqueryparam value="#FORM.SelDate#" cfsqltype="cf_sql_timestamp">
    AND
    <cfqueryparam value="#CalDate#" cfsqltype="cf_sql_timestamp">
</cfquery>

<cfquery name="Rooms_RS" datasource="HotelBookingSystem" username="HBSuser" password="HBSpass">
SELECT *
FROM Rooms
WHERE RoomID = <cfloop query="Check_Rooms_RS">#RoomID# OR </cfloop>0
</cfquery>
</cfif>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Hotel Booking System - User Manager</title>
<link rel="stylesheet" type="text/css" href="../style.css"/>
</head>
<body>
<div class="container">
    <div class="booking_choose_date">
         <cfparam name="PreSelDate" default="#LSDateFormat(Now(), 'dd/mm/yyyy')#">
<cfif isDefined("FORM.SearchRooms")>
    <cfset #PreSelDate# = #FORM.SelDate#>
</cfif>
        <cfform name="form1" width="375" height="350" action="#currentpage#">

           <cfinput type="DateField" name="SelDate" label="Block out starts" width="100" value="#PreSelDate#" mask="DD/MM/YYYY">

<cfselect size="1" name="SelDays" required="Yes" message="Select days staying">
      <option value="1" selected>1 Day</option>
      <option value="2">2 Days</option>
      <option value="3">3 Days</option>
      <option value="4">4 Days</option>
      <option value="5">5 Days</option>
      <option value="6">6 Days</option>
      <option value="7">7 Days</option>
</cfselect>
           <cfinput type="Submit" name="SearchRooms" value="Check" width="100">
        </cfform>
    </div>
     <cfif isDefined("FORM.SearchRooms")>
        <div class="search_results">
          
            <cfoutput query="Check_Rooms_RS">
                 #Check_Rooms_RS.RoomID#
            </cfoutput>
          
            <cfoutput query="Rooms_RS">
                 #Rooms_RS.RoomType#
            </cfoutput>
        </div>
    </cfif>
</div>
</body>
</html>
Little help with this would be amazing !!

I only skimmed this thread. But even ignoring the myriad of date issues, the queries have a serious "logic" problem. If you think about it, does searching for rooms that are not reserved in a table that only contains reserved rooms really make sense? Say you have twenty (20) rooms. If only two (2) of them are reserved (ie in the Bookings table), how is that first query supposed to account for the other eighteen (18)?
It would make more sense to search the Bookings table for rooms that are reserved. Then query your Rooms table for rooms not in that list (ie available). Granted that is not a very efficient method for a real application. But should work for your purposes.
This is my test data in the Bookings Table:
Are you storing the booking dates as strings? Dates should be stored in a date/time column. Storing them as strings creates all kinds of problems. Not to mention it makes it more difficult to use your database's date functions.

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