help with date difference

Hi! here is my code and it's not working right:

//Number of days late from may 15, 2008 or days late from fiscal year due date(current year ex: may15, current year) 
int intYear = DateTime.Now.Year;
DateTime may15 = new System.DateTime(intYear, 5, 15);
DateTime actualDate = DateTime.Now;
TimeSpan diffResult = actualDate - may15;
...