PHP, MySQL ข้อมูลวันที่แสดงเป็น 0000-00-00 ขณะที่แก้ไขข้อมูลอื่น

// ปฏิทิน
$date_y = substr($DOB,6,4); //ตัดเอาปี ค.ศ. มาทำเป็น พ.ศ.
$date_m = substr($DOB,3,2);//ตัดเอาเดือน
$date_d = substr($DOB,0,2);//ตัดเอาวันที่
$save_fulldate = $date_y."-".$date_m."-".$date_d;//เรียงใหม่

อันนี้คือโค๊ดที่อัพเดทค่ะ
//Update Data_Donor
	 include("../Index/config.inc.php") ;
	 $objQuery = mysql_query("select * from donor d join member m on d.DonorID = m.DonorID 
	             WHERE m.Username='$user'; ");
	 $dbarr = mysql_fetch_array($objQuery); 
	 
	 $CitizenID = $dbarr["CitizenID"];

		$sql[0] = "update donor set Initial='$Initial' where CitizenID='$CitizenID' ";
		
		$sql[1]= "update donor set Name='$Name' where CitizenID='$CitizenID' ";
		
		$sql[2] = "update donor set Surename='$Surename' where CitizenID='$CitizenID' ";
	
		$sql[3] = "update donor set CitizenID='$CitizenID' where CitizenID='$CitizenID' ";
	
		$sql[4] = "update donor set Gender='$Gender' where CitizenID='$CitizenID' ";
	
		$sql[5] = "update donor set DOB='$save_fulldate' where CitizenID='$CitizenID' ";
		
		$sql[6] = "update donor set Address='$Address' where CitizenID='$CitizenID' ";
	
	        $sql[7] = "update donor set Province ='$Pro'where CitizenID='$CitizenID' ";

		$sql[8] = "update donor set Amphur='$amp' where CitizenID='$CitizenID' ";
		
		$sql[9] = "update donor set Mobile='$Mobile' where CitizenID='$CitizenID' ";
		
		$sql[10] = "update donor set BloodG='$BloodG' where CitizenID='$CitizenID' ";
		
		$sql[11] = "update donor set Rh='$Rh' where CitizenID='$CitizenID' ";
		
		$sql[12] = "update donor set Remark='$Remark' where CitizenID='$CitizenID' ";
		
	        $sql[13] = "update donor set MobileH='$MobileH' where CitizenID='$CitizenID' ";
	
		$sql[14] = "update donor set BloodCount='$BloodCount' where CitizenID='$CitizenID' ";
		
		$objQuery = mysql_query("UPDATE member SET Name = '$Name' WHERE Username='$user' ");
		
       for($i=0;$i<=14;$i++) {
      $result = mysql_query($sql[$i]) or die("Error Program")  ;
       }

if($result) {
echo "<br><br><center><font size=\"3\" face='MS Sans Serif'><b>แก้ไขข้อมูลสมาชิกเรียบร้อยแล้วค่ะ</b></font></center>" ;
echo "<meta http-equiv='refresh' content='2; url=View_Donor.php'>" ;
}