求教一个php向mysql插入时间的问题

我可以从xml读到一个时间：1235716200000
似乎用的date的时候需要除1000
所以我用$start_time = $post->getElementsByTagName("StartTime")->item(0)->nodeValue/1000;

然后$query="INSERT INTO `test` (`start_time`) VALUES (".$start_time.")";
结果报错You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '06:30:00)' at line 1

加两个引号$query="INSERT INTO `test`(`start_time`) VALUES ('".$start_time."')";
也报错Incorrect datetime value: '1970-01-01 00:00:00' for column 'start_time' at row 1

求教达人，这是什么问题？原因是什么，应该怎么正确插入

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去掉点 .

要不把sql语句输出来看下

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$result = $db->query($query);
if (!$result){
echo $query."\n";
echo $db->error.$discover.' <br />';
}else{
//echo $Title."added. <br />";
}

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php变量在双引号中能直接使
$query="INSERT INTO `test` (start_time) VALUES ($start_time)";
这样子应该可以吧

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不行，报错

You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '06:30:00)' at line 1

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echo "INSERT INTO `test` (start_time) VALUES ($start_time)";