Some trouble with some code

[Guy G]

PHP Code:

$lang['GZIP_Enabled'] = 'GZIP: Enabled';
$lang['GZIP_Disabled'] = 'GZIP: Disabled';
$lang['Gen_Time'] = 'Generation Time: %s  Seconds';
$lang['Queries'] = 'Queries: %s';

$gzip = ($board_config['gzip_compress']) ? $lang['GZIP_Enabled'] : $lang['GZIP_Disabled']; 
$excuted_queries = $db->num_queries;
$mtime = microtime(); 
$mtime = explode(" ", $mtime); 
$mtime = $mtime[1] + $mtime[0]; 
$endtime = $mtime; 
$gentime = round(($endtime - $starttime), 2);
$template->assign_vars(array(
  'GENERATION_TIME' => sprintf($lang['Gen_Time'], $gentime),
  'NUMBER_QUERIES' => sprintf($lang['Queries'], $excuted_queries),
  'GZIP_TEXT' =>  $gzip,
)
);
$template->assign_block_vars('generation_time_switch', array() ); 


For some reason it gives me the seconds all wrong..

[Generation Time: 1114635571.26 Seconds] | [Queries: 3] | [GZIP: Enabled]