php Twitter Like time

so i am trying to get time like twitter/facebook/myspace my problem is that it is posting the time/date of the current time/date

I have 2 funtions

one being time_since() and add_post()

time_since() Time since is the function that returns year, day, minutes, seconds since.

 function time_since($time){
//The Output the time is used at
$format = "F m, Y g:i a";
 
//Time presets for the lazy (Time goes by seconds)
$timeyear = 365 * 24 * 60 * 60;
$timemonth = 30 * 7 * 24 * 60 * 60;
$timeweek = 7 * 24 * 60 * 60;
$timeday = 24 * 60 * 60;
$timehour = 60 * 60;
$timemins = 60;
$timeseconds = 1;
 
//today's date
$today = time();
 
//Get the time from today by minusing the time looked at by today's date
$x = $today - $time;
 
//These define the out put
if($x >= $timeyear){$x = date($format, $x); $dformat=""; $pre ="On the date: "; 
}elseif($x >= $timemonth){$x = date($format, $x); $dformat=""; $pre ="On the date: ";
}elseif($x >= $timeday){$x = round($x / $timeday); $dformat="days ago"; $pre ="About"; $x = round($x);
}elseif($x >= $timehour){$x = round($x / $timehour); $dformat="hours ago"; $pre ="About"; 
}elseif($x >= $timemins){$x = round($x / $timemins); $dformat="minutes ago"; $pre ="About";
}elseif($x >= $timeseconds){$x = round($x / $timeseconds); $dformat="seconds ago"; $pre ="About"; 
}
return $pre." ".$x." ".$dformat;
}

Code (markup):

add_post() adds the post to the database.

  function add_post($userid, $body)
  {
   $body = str_replace(":)","<img src=\"img/smilehappy.png\">",$body);
   $body = str_replace(":(","<img src=\"img/smilesad.png\">",$body);
   $body = str_replace("X(","<img src=\"img/smilemad.png\">",$body);
   $body = str_replace("o.O","<img src=\"img/smileoO.png\">",$body);
   $body = str_replace("><","<img src=\"img/smilesquint.png\">",$body);
   $body = str_replace(">_<","<img src=\"img/smileninja.png\">",$body);
   $body = str_replace(":S","<img src=\"img/smilesick.png\">",$body);
   $body = str_replace("zZz","<img src=\"img/smileZz.png\">",$body);
   $body = str_replace("oO","<img src=\"img/smilepo.png\">",$body);
   
      $sql = "insert into posts (user_id, body, stamp) 
      values ($userid, '" . mysql_real_escape_string($body) . "', now())";
      
      $result = mysql_query($sql);
  }

Code (markup):

then profile.php I have called the function time_since()

 <?php
$dateofpost = time_since($time);
$posts = show_posts($_SESSION['userid'], $list['id']);

if (count($posts)){
?>
  <table border='0' cellspacing='0' cellpadding='0' >
  <?php
foreach ($posts as $key => $list){
	echo "<tr valign='top'>\n";
	echo "<td><a href=\"/". $list['username'] ."\"><font color=black>".$list['username'] ."</font></a></td>\n";
	echo "<td>&nbsp;<font color=black><strong>".$list['body'] ."</strong></font> <a href=\"remove.php?id=". $list['id'] ."\">Remove</a><br/>\n";
	echo "<small>&nbsp;<font color=black>". $dateofpost ."</font></small></td>\n";
	echo "</tr>\n";
}
?>
  </table>
  <?php
}else{
?>
  <p><b>You haven't posted anything yet!</b></p>
  <?php
}
?>

Code (markup):

but it returns
Grind3r | what are you thinking?
On the date: July 07, 2009 7:42 pm

and that updates when the time changes and I posted that yesterday at like 6:00 pm.

anything anyone can do and or point me in the right direction