There are about 1184 days between September 17 2007 to December 14 2010.
922 days from September 23 2007 to April 2 2010.
Adding 90 days to September 30, 2010 gives December 29, 2010.
Sunday, September 26 2010 is 90 days before December 25 2010.
Adding 285 days to December 15, 2010 gives September 26, 2011.
927 days.
3027 days.
It would be September 13 2011!
September has 30 days. December has 31 days
There were 31 days in December 2007.
There were 31 days in December 2010.
Adding 100 days to September 6 in any year gives December 15 in the same year.
Depending where in the world you live when you work this question out, as of December 30, 2009 until 1st September 2010 (spring in Australia) there are 245 days.