--- a/rep2/post.php
+++ b/rep2/post.php
@@ -121,6 +121,11 @@
+if (!empty($_POST['p2_post_confirm_cookie']) && isset($_POST['time'])) {
+ $time = $_POST['time'];
+} else {
+ $time = time();
+}

--- a/lib/post_form.inc.php
+++ b/lib/post_form.inc.php
@@ -134,7 +134,6 @@
-<input type="hidden" name="time" value="{$time}">

としてみたけど書けるかな？