Around January 9th 2012.
Adding 90 days to October 7, 2011 gives January 5, 2012.
Adding 90 days to October 20, 2010 gives January 18, 2011.
90 days before it was the 2nd of May 2011. 90 days after it was the 29th of October 2011.
The date which falls 90 days after February 2, 2011 is May 3, 2011.
Counting from December 1, 2011, adding 90 days to this date gives February 29, 2012.
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.
What date is 90 days before December 25 2012
Subtracting 90 days from April 15, 2011 gives January 15, 2011.
Adding 90 days to July 19 gives October 17.
Adding 90 days to October 16 of any year gives January 14 of the following year. For example, 90 days on from October 16, 2010 is January 14, 2011.
The date which falls 90 days after December 4, 2010 is March 4, 2011.