Hope someone can help me 
If I borrowed points for a March 2011 trip with points from 2011 and have an April use year, do those points need to be used by April 1st 2011? What happens if the trip starts March 29th and goes through April 7th? So the points would be used during the trip but not all by April 1st? I have 0 2011 points remaining and around 125 from 2012. I am currently booked in mid March but want to change the dates as I listed above?? Will I lose the points if I change the dates??? Sorry if confusing-
Thanks for any help!!!

If I borrowed points for a March 2011 trip with points from 2011 and have an April use year, do those points need to be used by April 1st 2011? What happens if the trip starts March 29th and goes through April 7th? So the points would be used during the trip but not all by April 1st? I have 0 2011 points remaining and around 125 from 2012. I am currently booked in mid March but want to change the dates as I listed above?? Will I lose the points if I change the dates??? Sorry if confusing-
Thanks for any help!!!