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DateTime now = DateTime.Now;
DateTime t1 = new DateTime(1990, 1, 1);
DateTime t2 = new DateTime(2008, 12, 30);
if (now > t1 && now < t2)
{
//
string aa = "YES";
}
DateTime tomorrow = new DataTime(2008,7,2);
DateTime yestoday = new DataTime(2008,6,30);
DateTime today = DataTime.Today;
// then , today < tomorrow, today > yestoday