Adding 180 days to September 9 on a non-leap year gives March 7 of the following year. Adding 180 days to September on a leap year gives March 6 of the following year.
180 days from September 14, 2011 is March 23, 2011.
180 days after June 9th, 2011 would be Tuesday December 6th, 2011.
Adding 180 days to September 20, 2010 gives March 19, 2011.
The 13th of March is 180 days before it. The 8th of March is 180 days after it, except when that March is in a leap year, in which case the 7th of March is 180 days after it.
In a non-leap year, adding 180 days to January 9 gives July 8. In a leap year, adding 180 days to January 9 gives July 7.
Adding 180 days to September 28, 2011 gives March 26, 2012.
Adding 180 days to September 20, 2008 gives March 19, 2009.
Adding 180 days to September 17, 2010 gives March 16, 2011.
Adding 180 days to September 13 leading into a non-leap year gives March 12 of the following year. Adding 180 days to September 13 leading into a leap year gives March 11 of the following year.
September 1, 2010 + 180 days = February 28, 2011.
Adding 180 days to March 19 gives September 15.
Adding 180 days to April 2, 2010 gives September 29, 2010.