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.
July 13 2010 plus 180 days is Sunday, January 9, 2011.
Adding 180 days to January 11, 2011 gives July 10, 2011.
JANUARY 4, 2012
Saturday, July 7, 2012
January 11, 2012
Monday, July 16, 2012
Sunday, January 13, 2013
January 31 + 180 days = July 30.
That would be July 4th, 2011. If you're using one of those 180-days fuses, it was lit at the right time.
180 days after June 9th, 2011 would be Tuesday December 6th, 2011.
January 9, 2011 + 180 days = July 8, 2011.
In a normal year, adding 180 days to January 18 gives July 17 of the same year. Adding 180 days to January 18 in a leap year gives July 16.