how to subtract date

Just use the following code:

DateTime dateFrom = new DateTime(1982, 8, 23);
DateTime dateTo = new DateTime(2011, 12, 5);

TimeSpan numberOfDaysInterval = dateTo.Subtract(dateFrom);

double daysAgo = numberOfDaysInterval.TotalDays;

string showDays = daysAgo.ToString("0");

This will just output the integer value of the difference of the dates.