[TigerC10]

You don't replace it with anything. The variable being used $vbulletin->options['timeformat'] will be in your vBulletin date/time format options.

If you want to learn about the "H:i" modifier characters, view this page:
http://us2.php.net/manual/en/function.date.php



Have you tried

PHP Code:

$gnptime = vbdate('i', $gthread[lastpost]); 


If you want to do it in a more complicated way it would be:

PHP Code:

$majormin = date('H', $gthread[lastpost]) * 60;
$minormin = date('i', $gthread[lastpost]);

$gnptime = $majormin+$minormin;