ต้องการเก็บข้อมูลเป็น date จาก Javascript Calendar Date Picker ลงMysql ครับ

<link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.16/themes/base/jquery-ui.css" type="text/css" media="all" />
 <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.6.2/jquery.min.js" type="text/javascript"></script>
 <script src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.16/jquery-ui.min.js" type="text/javascript"></script>
<script type="text/javascript">
$(function () {
$('#txtstartNow').datepicker({ dateFormat: 'yy-mm-dd' });
$('#txtstartNow').datepicker();
$('#txtendNow').datepicker({ dateFormat: 'yy-mm-dd' });
$('#txtendNow').datepicker();
});
</script>
<form id="form1" name="form1" method="post" action="data_act_save.php" enctype="multipart/form-data" onsubmit="return checkma()">
                 <table width="100%" border="0" cellpadding="0"  bgcolor="#FFFFFF"cellspacing="2">
                          
                         <tr>
                             <td><div align="right" class="style19">ชื่อกิจกรรม : </div></td>
                             <td><label><input name="name_act" type="text" id="name_act" size="40" />
                             </label></td>
                           </tr>
                           <tr>
                             <td width="99"><div align="right" class="style19">วันที่ : </div></td>
                             <td width="480"><input type="text" id="txtstartNow" name="txtstartNow"  /></td>
                           </tr>
                           
                           <tr>
                             <td valign="top"><div align="right" class="style19">รายละเอียด : </div></td>
                             <td><textarea name="detail_act" cols="100" rows="9" id="detail_act"></textarea></td>
                           </tr>
                           <tr>
                             <td>&nbsp;</td>
                             <td><input name="submit" type="submit" id="submit"  value="บันทึก"/>
                               <input name="submit2" type="reset" id="submit2" value="ยกเลิก"/></td>
                           </tr>
                          
                       </table>
                   
                   
                 </form>

include("../include/connect.php"); 
$strSQL = "SELECT * FROM nt_act WHERE  name_act = '".trim($_POST["name_act"])."' ";
$objQuery = mysql_query($strSQL);
$objResult = mysql_fetch_array($objQuery);
if($objResult)
{
echo "<table width='346' height='35' border='0' cellpadding='0' cellspacing='0'>
        <tr>
        <td background='../../images/dug.png'>&nbsp;&nbsp;&nbsp;&nbsp; <span  class='style18'>&nbsp;&nbsp; บันทึก ชื่อกิจกรรม ซ้ำกันไม่ได้ กรุณาตรวจสอบ !</span>
		</td>
        </tr>
        </table>";
echo "<meta http-equiv=refresh content=3;URL=adta_act.php>";
}
else
{
$date_in = date("d-m-Y");
$strSQL = "INSERT INTO nt_act "; 
$strSQL .="(id_act,name_act,date_act,detail_act,id_photo,date_in,status_act) "; 
$strSQL .="VALUES "; 
$strSQL .="('','".$_POST["name_act"]."','".$_POST["txtstartNow"]."','".$_POST["detail_act"]."','','$date_in','') "; 
$objQuery = mysql_query($strSQL); 
if($objQuery) 
{  
echo "<table width='346' height='35' border='0' cellpadding='0' cellspacing='0'>
        <tr>
        <td background='../../images/end.png'>&nbsp;&nbsp;&nbsp;&nbsp; <span class='style17'>&nbsp;&nbsp; บันทึกข้อมูลเรียบร้อย</span>
		</td>
        </tr>
        </table>";
echo "<meta http-equiv=refresh content=0;URL=data_act.php>";
//echo "<a href='menu-from.php' title='กลับ'>[กลับหน้าหลัก]</a>";
} 
else
{    
echo "Error Save [".$strSQL."]"; 
} 
}
mysql_close($objConnect); 
?></td>