Obtenez le nombre de jours entre deux objets DateTime différents

Utilisez la méthode de soustraction:

static void Main(string[] args)
{
    DateTime begin = DateTime.Now;
    DateTime end = begin.AddYears(1).AddMonths(1);
    var result = end.Subtract(begin).TotalDays;
}

DateTime start = DateTime.Now;
DateTime end = DateTime.Now.AddDays(5);
TimeSpan span = end.Subtract(start);
return span.Days;

DateTime dt1 = new DateTime(2011,01,01);
DateTime dt2 = new DateTime(2011,01,20);
int ireturn = (int)dt2.Subtract(dt1).TotalDays;

        int days = 10;
        DateTime initialDate = DateTime.Now;
        DateTime endDate = DateTime.Now.AddDays(days);
        TimeSpan duration = endDate.Subtract(initialDate);
In this example you can use either span.Days or span.TotalDays, however you have to be very careful with TimeSpan properties.  If you look at the TotalHours vs Hours for example you'll see that they are not the same.The Hours property is the number of hours remaining after the days property has been taken off (in this case zero), the Total hours is the TimeSpan represented in hours.

Soustraire DateTimes donnera une période de temps: xxx