Don't confuse Use Year with Calendar year. They are totally separate things.
Calendar Year 2005 goes Jan 1, 2005 through Dec 31, 2005 as you know. However use years are different. A vacation in calendar May 2005 could use points from EITHER your 2005 Feb use year, OR your 2004 Dec use year.
Make yourself a use year chart. A December UY would look like this:
<b>Use Year.....Vacation Dates</b>
2003.....Dec 1, 2003 through Nov 30, 2004
2004.....Dec 1, 2004 through Nov 30, 2005
2005.....Dec 1, 2005 through Nov 30, 2006
2006.....Dec 1, 2006 through Nov 30, 2007
2007.....Dec 1, 2007 through Nov 30, 2008
2008.....Dec 1, 2008 through Nov 30, 2009
Your February use year looks like this:
<b>Use Year.....Vacation Dates</b>
2003.....Feb 1, 2003 through Jan 31, 2004
2004.....Feb 1, 2004 through Jan 31, 2005
2005.....Feb 1, 2005 through Jan 31, 2006
2006.....Feb 1, 2006 through Jan 31, 2007
2007.....Feb 1, 2007 through Jan 31, 2008
2008.....Feb 1, 2008 through Jan 31, 2009
and so on.
If you wanted to take a vacation in May of 2005, you would use points from either your 2004 Dec use year, or your 2005 Feb use year.
If you bank points from one year to the next, they go to the next line on the chart. If you banked your 2004 Dec UY points they would go into 2005 UY which means they could only be used for a vacation between Dec 1, 2005 and Nov 30, 2006. For a May 2005 vacation you use your regular Dec 2004 UY points.
You make your reservations up to 11/7 months prior to your check-out date. For example you could make an 11-month reservation today for a May 2005 vacation, using points from either your Dec 2004 UY or your Feb 2005 UY. For a 7-month reservation for May, you would have to wait until October before you could make the reservation.
Hope this helps.