ฟังชั่น DATEDIFF ใส่แล้วมันไม่ select ข้อมูลขึ้นมาให้ เป็นเพราะอารายค่ะ

$Delauto = mysql_query("SELECT * FROM deleteblood WHERE Status='จอง' AND DateDiff(Date_Delete,NOW()) > 2");
		while($objDel = mysql_fetch_array($Delauto)){ 
			$ID = $objDel["DonorID"];
			$Bag = $objDel["BagNumber"];
			$BloodG = $objDel["BloodG"];
			$Date_Do = $objDel["Date_Donation"];
			$Date_Ex = $objDel["Date_Expire"];
			$Date_del = $objDel["Date_Delete"];
			$Type = $objDel["Type"];
			$Quan = $objDel["Quan"];
			$Receiv = $objDel["receiver"];
		 }
		}
		echo"คัยหมดอายุ".$ID."<br>";	
	    echo "คัยอ่า".$del2;
		
		if(DateDiff(Date_Delete,NOW()) > 2){
		$reinsert = mysql_query("INSERT INTO receive (BagNumber,DonorID,BloodG,Date_Donation,Date_Expire,Type,Quan,Examine,Status) VALUES  ('$ID','$Bag','$BloodG','$Date_Do','$Date_Ex','$Type','$Quan','$Exam','$CC')");