329 days from Feb 21 2010 is Sunday, January 16, 2011.
Adding 180 days to July 20, 2010 gives January 16, 2011.
Adding 179 days to January 18, 2011 gives July 16, 2011.
Adding 120 days to March 16, 2011 gives July 14, 2011.
198 days from the start date to the end date, end date included.
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.
100 days before June 24th 2011 will be Wednesday, March 16, 2011.
16 April 2012.
Monday, July 16, 2012
Wednesday, January 16, 2013
Including the start and end dates in the calculation, there are 231 days between the two dates.
Adding 180 days to January 17 on a non-leap year gives July 16. Adding 180 days to January 17 on a leap year gives July 15.