Calculate difference between two dates in year month and day

// to get the difference between two dates
       public static void GetDifference(DateTime date1, DateTime date2, out int Years, out int Months, out int Weeks, out int Days)
       {
           //assumes date2 is the bigger date for simplicity
           //----------------------------------------------
           //years
           TimeSpan diff = date2 - date1;
           Years = diff.Days / 366;
           DateTime workingDate = date1.AddYears(Years);
           while (workingDate.AddYears(1) <= date2)
           {
               workingDate = workingDate.AddYears(1);
               Years++;
           }
           //---------------------------------------------
           //months
           diff = date2 - workingDate;
           Months = diff.Days / 31;
           workingDate = workingDate.AddMonths(Months);
           while (workingDate.AddMonths(1) <= date2)
           {
               workingDate = workingDate.AddMonths(1);
               Months++;
           }
           //---------------------------------------------
           //weeks and days
           diff = date2 - workingDate;
           Weeks = diff.Days / 7; //weeks always have 7 days
           Days = diff.Days % 7;
           //---------------------------------------------
       }