Here’s some useful code if you need to know how much time has elapsed between two days.
DateTime oldDate = new DateTime(2005, 7, 31);
DateTime newDate = DateTime.Now;
// Difference in days, hours, and minutes.
TimeSpan timeSpan = newDate - oldDate;
// determine how many days are in the time span
int differenceInDays = timeSpan.Days;
labelDateDifference.Text = differenceInDays.ToString();