Heading into a non-leap year, adding 180 days to October 18 gives April 16 of the following year. Heading into a leap year, adding 180 days to October 18 gives April 15 of the following year.
16 April 2012.
April 4, 2012
April 10, 2012
Adding 180 days to October 9, 2010 gives April 7, 2011.
Adding 180 days to October 29, 2010 gives April 27, 2011.
October 13, 2010 + 180 days = April 11, 2011.
July 13 2010 plus 180 days is Sunday, January 9, 2011.
April 18, 2011
The 25th of October 2011.
Adding 180 days to April 11, 2011 gives October 8, 2011.
Adding 180 days to October 4, 2010 gives April 4, 2011.
Adding 180 days to October 6, 2010 gives April 4, 2011.