January 17 + 120 days = May 17 (except in a leap year).
In a non-leap year, the day 120 days before June 17 is February 17. In a leap year, such as 2008, the day 120 days before June 17 is February 18.
Adding 120 days to May 20, 2010 gives September 17, 2010.
Adding 180 days to September 17, 2010 gives March 16, 2011.
Monday the 13th of February 2012.
Adding 120 days to November 17, 2009 gives March 17, 2009
Adding 179 days to December 20, 2010 gives June 17, 2011.
May 17 in leap years May 18 in regular years
Adding 180 days to January 17 on a non-leap year gives July 16. Adding 180 days to January 17 on a leap year gives July 15.
120 days is about 17 weeks and a day and a half
The 14th of September is 120 days after the 17th of May. In a standard year, the 17th of January is 120 before it and in a leap year the 18th of January is 120 days before it.
About 17 weeks. Just do 120 divide by 7, since 7 days in a week.