331 days after January 1 2011, would fall on November 27 2011.
January 9, 2011 + 180 days = July 8, 2011.
Adding 120 days to January 28, 2011 gives May 28, 2011.
Adding 180 days to January 24, 2011 gives July 23, 2011.
Adding 180 days to January 13, 2011 gives July 12, 2011.
Adding 120 days to January 27, 2011 gives May 27, 2011.
January 20, 2012
The 18th of January, 2012.
25 January 2012.
Tuesday, January 3rd, 2012 is 120 days after September 5th, 2011.
Adding 180 days to July 18, 2011 gives January 14, 2012.
Adding 90 days to October 7, 2011 gives January 5, 2012.
180 days after July 8 2010 would be on January 4 2011.