DataTime t1=Convert.ToDataTime("在此處加入日期 ");
DataTime t2=Convert.ToDataTime("在此處加入日期 ");
DataTime.Compare(t1,t2)
若DataTime.Compare(t1,t2)結果>0,則有t1>t2
若DataTime.Compare(t1,t2)結果<0,則有t1<t2
若DataTime.Compare(t1,t2)結果=0,則有t1=t2
SQSQL Server中datetime的範圍是1573-01-01 00:00:00—9999-01-01 00:00:00