string t1 = "2005-1-1 0:00:00";
string t2 = "2005-3-4 0:00:00";
string x = ""; //求t1与t2相差的天数
DateTime dt1=DateTime.Parse(t1);
DateTime dt2=DateTime.Parse(t2);
TimeSpan myTspan=dt2-dt1;
x=myTspan.Days.ToString();
MessageBox.Show(x);
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