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AddEventHandler("main", "OnEndBufferContent", "ChangeMyContent");
function ChangeMyContent($content)
{
   $content = str_replace("aaa", "bbb", $content);
}

 AddEventHandler("main", "OnEndBufferContent", "OnEndBufferContentHandler");
function OnEndBufferContentHandler($content)
{
    //echo'<pre>';var_dump($content);echo'</pre>';die();
   if (defined("ADMIN_SECTION"))
        $content = str_replace('<td class="adm-workarea-wrap adm-workarea-wrap-top">', '<td class="adm-workarea-wrap adm-workarea-wrap-top"><div class="adm-menu-wrapper" style="overflow:hidden; min-width:300px;"><div style="color: #000">Текущее время '.date("d.m.Y H:i:s").'</div><br><div style="color: red">Это версия для Академии Битрикса!</div>', $content);
}

// Удаляем лишние пробелы и пустые строки в html перед выводом пользователю
AddEventHandler("main", "OnEndBufferContent", "ChangeMyContent");

function ChangeMyContent(&$content)
{
   $content = sanitize_output($content);
}

function sanitize_output($buffer)
{
    $search = array(
        '/\>[^\S ]+/s', //strip whitespaces after tags, except space
        '/[^\S ]+\</s', //strip whitespaces before tags, except space
        '/(\s)+/s'  // shorten multiple whitespace sequences
        );
    $replace = array(
        '>',
        '<',
        '\\1'
        );

    $blocks = preg_split('/(<\/?pre[^>]*>)/', $buffer, null, PREG_SPLIT_DELIM_CAPTURE);
    $buffer = '';
    foreach($blocks as $i => $block)
    {
      if($i % 4 == 2)
        $buffer .= $block; //break out <pre>...</pre> with \n's
      else 
        $buffer .= preg_replace($search, $replace, $block);
    }

    return $buffer;
}