juliocarlosmg

a couple of months ago i had to make a Date class for the school. here you have something that may help you. perhaps you will need to change something but the idea is correct and its work. it's very simple, so, don't need any explanations.

int CountLeapYears(int startingYear, int endingYear)
{
if (startingYear < 1 || startingYear > 9999 || endingYear < 1 || endingYear > 9999)
throw new ArgumentOutOfRangeException();
if (startingYear == endingYear)
throw new ArgumentException();
int ydiff = startingYear - endingYear;
if (ydiff < 0)
ydiff = -ydiff;
return ydiff / 4 - ydiff / 100 + ydiff / 400;
}

int CountDays(DateTime dt1, DateTime dt2)
{
if (dt1 == null || dt2 == null)
throw new ArgumentNullException();
if (dt1.Year >= dt2.Year)
throw new ArgumentException();
int ydiff = dt2.Year - dt1.Year;
int c = ydiff * 365 + CountLeapYears(dt1.Year, dt2.Year) - dt1.DayOfYear + dt2.DayOfYear;
}