PHP select ,update record หน้าฟอร์ม ติดปัญหา !! หากรับค่ามา where

<?php


	
$objConnect = mysql_connect("localhost","root","12345678") or die("Error Connect to Database");
$objDB = mysql_select_db("es_db");


//*** Update Condition ***//
if($_POST["hdnCmd"] == "Update")
{
	$strSQL = "UPDATE employee SET ";
	$strSQL .="uniform_size = '".$_POST["txtSize"]."' ";
	$strSQL .="WHERE id = '".$_POST["hdnEditID"]."' ";
	$objQuery = mysql_query($strSQL);
	if(!$objQuery)
	{
		echo "Error Update [".mysql_error()."]";
	}
	//header("location:$_SERVER[PHP_SELF]");
	//exit();
}

/*$strSQL = "SELECT * FROM employee where hireDate between '".$_GET['date1']."' and '".$_GET['date2']."'";*/	//หากรับค่ามา การ update ไม่ทำงาน	
$strSQL = "SELECT * FROM employee where hireDate between '2019-06-03' and '2019-06-03'";    //หากใช้แบบนี้ ใช้งานได้ปกติ
$objQuery = mysql_query($strSQL) or die ("Error Query [".$strSQL."]");
?>

<form name="frmMain" method="post" action="<?php echo $_SERVER["PHP_SELF"];?>">
<input type="hidden" name="hdnCmd" value="">
<table width="80%" align="center" cellpadding="0" cellspacing="1" bgcolor="#3D3B3B">
  <tr bgcolor="#FFFFFF">
    <th width="80"> <div align="center">EN </div></th>
    <th width="100"> <div align="center">Hire Date</div></th>
    <th width="100"> <div align="center">Probation Date</div></th>
    <th width="200"> <div align="center">Name-LastName</div></th>
    <th width="150"> <div align="center">BU </div></th>
    <th width="150"> <div align="center">Supervisor </div></th>
	<th width="100"> <div align="center">Building </div></th>
    <th width="50"> <div align="center">Gender </div></th>
	<th width="100"> <div align="center">Uniform Size </div></th>
    <th width="100"> <div align="center">Edit </div></th>
 
  </tr>
<?php
while($objResult = mysql_fetch_array($objQuery))
{
?>

  <?php
	if($objResult["id"] == $_GET["ID"] and $_GET["Action"] == "Edit")
	{
  ?>
  <tr bgcolor="#FFFFFF">
    <td>
		<div align="center">
		<?php echo $objResult["id"];?>
		<input type="hidden" name="hdnEditID" size="5" value="<?php echo $objResult["id"];?>">
		</div>
	</td>
    <td><?php echo $objResult["hireDate"];?></td>
    <td><?php echo $objResult["probation_date"];?></td>
    <td><div align="center"><?php echo $objResult["full_name"];?></div></td>
    <td align="left"><?php echo $objResult["BU"];?></td>
    <td align="left"><?php echo $objResult["supervisor"];?></td>
	<td align="left"><?php echo $objResult["building"];?></td>
    <td align="left"><?php echo $objResult["gender"];?></td>
	<td align="left"><input type="text" name="txtSize" size="5" value="<?php echo $objResult["uniform_size"];?>"></td>
    <td colspan="2" align="left"><div align="center">
      <input name="btnAdd" type="button" id="btnUpdate" value="Update" OnClick="frmMain.hdnCmd.value='Update';frmMain.submit();">
	  <input name="btnAdd" type="button" id="btnCancel" value="Cancel" OnClick="window.location='<?php echo $_SERVER["PHP_SELF"];?>';">
    </div></td>
  </tr>
  <?php
	}
  else
	{
  ?>
  <tr bgcolor="#FFFFFF">
    <td><div align="center"><?php echo $objResult["id"];?></div></td>
    <td>&nbsp;<?php echo $objResult["hireDate"];?></td>
    <td>&nbsp;<?php echo $objResult["probation_date"];?></td>
    <td><div align="left">&nbsp;<?php echo $objResult["full_name"];?></div></td>
    <td align="left">&nbsp;<?php echo $objResult["BU"];?></td>
    <td align="left">&nbsp;<?php echo $objResult["supervisor"];?></td>
	<td align="left">&nbsp;<?php echo $objResult["building"];?></td>
    <td align="left">&nbsp;<?php echo $objResult["gender"];?></td>
	<td align="left">&nbsp;<?php echo $objResult["uniform_size"];?></td>
    <td align="center"><a href="<?php echo $_SERVER["PHP_SELF"];?>?Action=Edit&ID=<?php echo $objResult["id"];?>">Edit</a></td>
	
  </tr>
  <?php
	}
  ?>
<?php
}
?>

</table>
</form>
<?php
mysql_close($objConnect);
?>
</body>
</html>