Save date in mysql using php form processing

I have tried every example I can find and nothing works. My mysql column 1 is called date and is a datetime field. The best I can get is 0000.00.00 00.00.00 here is the code I am using without the date as I can't get it to work.

<?php

$where_form_is="http://".$_SERVER['SERVER_NAME'].strrev(strstr(strrev($_SERVER['PHP_SELF']),"/"));

include("config.inc.php");
$link = mysql_connect($db_host,$db_user,$db_pass);
if(!$link) die ('Could not connect to database: '.mysql_error());
mysql_select_db($db_name,$link);
$query = "INSERT into `".$db_table."`     (field_1,field_2,field_3,field_4,field_5,field_6,field_7,field_8,field_9,field_10,field_11,field_12,field_13,field_14,field_15,field_16,field_17,field_18,field_19,field_20,field_21,field_22,field_23,field_24,field_25) VALUES ('" . $_POST['field_1'] . "','" . $_POST['field_2'] . "','" . $_POST['field_3'] . "','" . $_POST['field_4'] . "','" . $_POST['field_5'] . "','" . $_POST['field_6'] . "','" . $_POST['field_7'] . "','" . $_POST['field_8'] . "','" . $_POST['field_9'] . "','" . $_POST['field_10'] . "','" . $_POST['field_11'] . "','" . $_POST['field_12'] . "','" . $_POST['field_13'] . "','" . $_POST['field_14'] . "','" . $_POST['field_15'] . "','" . $_POST['field_16'] . "','" . $_POST['field_17'] . "','" . $_POST['field_18'] . "','" . $_POST['field_19'] . "','" . $_POST['field_20'] . "','" . $_POST['field_21'] . "','" . $_POST['field_22'] . "','" . $_POST['field_23'] . "','" . $_POST['field_24'] . "','" . $_POST['field_25'] . "')";

mysql_query($query);
mysql_close($link);

include("confirm.html");

?>

Someone must be able to get it to work. Please