怎样用php往mysql中添加当前时间和日期？

<?php require_once('Connections/db.php'); ?>
<?php
function GetSQLValueString($theValue, $theType, $theDefinedValue = "", $theNotDefinedValue = "")
{
$theValue = (!get_magic_quotes_gpc()) ? addslashes($theValue) : $theValue;

switch ($theType) {
case "text":
$theValue = ($theValue != "") ? "'" . $theValue . "'" : "NULL";
break;
case "long":
case "int":
$theValue = ($theValue != "") ? intval($theValue) : "NULL";
break;
case "double":
$theValue = ($theValue != "") ? "'" . doubleval($theValue) . "'" : "NULL";
break;
case "date":
$theValue = ($theValue != "") ? "'" . $theValue . "'" : "NULL";
break;
case "defined":
$theValue = ($theValue != "") ? $theDefinedValue : $theNotDefinedValue;
break;
}
return $theValue;
}

$editFormAction = $_SERVER['PHP_SELF'];
if (isset($_SERVER['QUERY_STRING'])) {
$editFormAction .= "?" . htmlentities($_SERVER['QUERY_STRING']);
}

if ((isset($_POST["MM_insert"])) && ($_POST["MM_insert"] == "form1")) {
$insertSQL = sprintf("INSERT INTO indb (bt, nr) VALUES (%s, %s)",
GetSQLValueString($_POST['bt'], "text"),
GetSQLValueString($_POST['nr'], "text"));

mysql_select_db($database_db, $db);
$Result1 = mysql_query($insertSQL, $db) or die(mysql_error());

$insertGoTo = "houtai.php";
if (isset($_SERVER['QUERY_STRING'])) {
$insertGoTo .= (strpos($insertGoTo, '?')) ? "&" : "?";
$insertGoTo .= $_SERVER['QUERY_STRING'];
}
header(sprintf("Location: %s", $insertGoTo));
}
?><html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>无标题文档</title>
</head>

<body>
<form action="<?php echo $editFormAction; ?>" name="form1" method="POST">
<table width="800" border="0" align="center" cellpadding="0" cellspacing="0">
<tr>
<td height="28">标题
<label>
<input name="bt" type="text" id="bt" size="40">
</label></td>
</tr>
<tr>
<td height="210"><label>
<textarea name="nr" cols="70" rows="20" id="nr"></textarea>
</label></td>
</tr>
<tr>
<td height="20"><label>
<input type="submit" name="Submit" value="提交">
<input type="reset" name="Submit2" value="重置">
</label></td>
</tr>
</table>

<input type="hidden" name="MM_insert" value="form1">
</form>
</body>
</html>

上面是我用DW做的页面。请帮我看看这代码要怎么该才能实现往mysql里添加当前时间和日期。不要光发个now()或函数啊，网址啊等等，我要的是答案。谢谢能帮我的朋友。不会的或会一点的就别多浪费时间了。谢谢了。急等答案！

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