I may be missing something here, but it seems to me that if you are wondering how many days are in left to complete 2007 prophetic years, you multiply 2007 x 360 = 722,520 days.  Take away the amount of days you already calculated 722,520 (2007 prophetic years) - 722,449 (2006.8029 prophetic years) = 71 days left to complete 2007 prophetic years.   (or you could simply multiply 360 x .1971 = 70.956)
 
71 days from 1/01/08 is March 11, 2008 (this is a leap year)