I've already added this to the next version but I want it to be more tested.
changing the admin/index.php in about line 420~450 where it is going to save the new post will do the job.
Code:
// save new post
if($_GET['x'] == "save") {
$headline = clean($_POST['headline']);
$body = clean($_POST['body']);
$datetime =
$_POST['post_year']."-".
$_POST['post_month']."-".
$_POST['post_day']." ".
$_POST['post_hour'].":".
// modified by ramin add second to the publising time.
// This will enables you to send multiple entries a day
$_POST['post_minute'].":".date('s');