180 days after June 9th, 2011 would be Tuesday December 6th, 2011.
There are 31 days in May, 30 in June and 31 in July. 180 days after May 9, 2011 is August 7, 2011.
Adding 180 days to December 30, 2010, gives June 28, 2011.
The day that is 180 days after 31 December 2011 (the 180th day of 2012) is 28 June 2012.
Adding 180 days to December 18, 2010 gives June 16, 2011.
Adding 180 days to December 13, 2010 gives June 11, 2011.
Adding 180 days to April 2, 2011 gives September 29, 2011.
Adding 180 days to March 1, 2011 gives August 28, 2011.
January 9, 2011 + 180 days = July 8, 2011.
Adding 180 days to April 5, 2011 gives October 2, 2011.
Adding 180 days to February 8, 2011 gives August 7, 2011.
180 days from September 14, 2011 is March 23, 2011.
180 days after Wed, Mar 9, 2011 = Mon, Sep 5, 2011