May 17 in leap years
May 18 in regular years
February 14, 2010 + 100 days = May 25, 2010.
In any given year, the date 100 days before February 1 is October 24 of the previous year.
Adding 100 days to February 14, 2009 gives May 25, 2009.
Adding 100 days to March 18, 2011 gives June 26, 2011.
The 29th of October 2011.
100 days after Feb. 1 is May 11 in leap years and May 12 in regular years.
Adding 100 days to February 6 in a non leap year gives May 17. Adding 100 days to February 6 in a leap year gives May 16.
100 days after Friday, February 12, 2010 = Sunday, May 23, 2010.
100 days after January 1 is April 10. January has 31 days, so there are 30 days remaining after January. Then, February has 28 days (29 if it's a leap year), and March has 31 days, totaling 30 + 28 + 31 = 89 days. Adding those to January gives you 30 + 89 = 119 days, meaning 100 days after January 1 falls on April 10.
January 27, 2010 + 100 days = May 7, 2010.
As of today's date, August 17, 2010, there are 257 days until May 1, 2011.
Monday the 25th of October 2010 is 100 days before it. Friday the 13th of May 2011 is 100 days after it.