[Issvar]

Use a query like "SELECT post,date FROM posts ORDER BY date", and loop through it, like

$curdate=""
while ($data = mysql_fetch_object($queryresults)) {
  if ($data->date != $curdate) {
    echo '<br>'.$data->date.'<br>';
    $curdate = $data->date;
  }
  echo $data->post.'<br>';
}