select表单问题，大家帮帮忙

Question

<?php
$year = $_POST["year"];
$month = $_POST["month"];
$day = $_POST["day"];
$date = $year."-".$month."-".$day
?>

Answer 1

<?php
$year = $_POST["year"];
$month = $_POST["month"];
$day = $_POST["day"];
$date = $year."-".$month."-".$day
?>
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it is right.date is euqal to varchar.and you'd better:<option value="09">9</option>
<option value="10">10</option>

Answer 2

yes.
zeroleonhart say is very good.