90 days after December 1st is Tuesday, March 1, 2011.
March 29 2009 was 90 days after December 29 2008.
What date is 90 days before December 25 2012
90 days after Tuesday, December 28, 2010 = Monday, March 28, 2011.
Adding 90 days to December 23, 2010 gives March 23, 2011.
The date which falls 90 days after December 4, 2010 is March 4, 2011.
Counting from December 1, 2011, adding 90 days to this date gives February 29, 2012.
Sunday, September 26 2010 is 90 days before December 25 2010.
March 7th
Adding 90 days to December 23 heading into a non-leap year, gives March 23 of the following year. Adding 90 days to December 23 heading into a leap year, gives March 22 of the following year.
Monday the 5th of December 2011 is 90 days and the 6th of September 2011.
Sunday the 4th of December 2011 is 90 days and the 5th of September 2011.
Adding 90 days to September 16, 2009 gives December 12, 2009.