做生日提醒遇到问题

Question

DateTime birth = new DateTime(DateTime.Now.Year, "生日月", "生日天");
DateTime today = new DateTime(DateTime.Now.Year, DateTime.Now.Month, DateTime.Now.Day);
TimeSpan ts = bitrh - today;
        int days = ts.TotalDays;

Answer 1

DateTime dtone = Convert.ToDateTime("2007-1-1 05:32:22");
        DateTime dtwo = Convert.ToDateTime("2007-1-1 04:20:15");
        TimeSpan span = dtone.Subtract(dtwo); 
    int days = span .TotalDays; 

Answer 2

DateDiff(Day,DateAdd(year,DateDiff(year,Birthday,GetDate()),Birthday),GetDate())  
TimeSpan 计算间隔