vbdate within AdminCP problem

[Antivirus]

Having trouble converting the date $tour['tourdate'] into formatted date within the admincp.

Here's my code which displays the unformatted date just fine:

PHP Code:

function print_tour_row($tour) 
{
    print_cells_row(array(
        "<a href=\"erc_edittour.php?tourid=".$tour['tourid']."\">" . $tour['tourdate'] . "</a>", 
        $tour['artisttitle'], 
        "<a href=\"erc_editvenue.php?venueid=".$tour['tourvenueid']."\">".$tour['venuetitle']."</a>",
        $tour['venuecitystate'], 
        $tour['tourid'], 
        $tour['tourstatus'],
        "<input type=\"radio\" name=\"idforaction\" value=\"" . $tour['tourid'] . "\">
    "));
} 


But when i try to format the date using vbdate as follows, the date completely disappears :

PHP Code:

function print_tour_row($tour) 
{
    print_cells_row(array(
        "<a href=\"erc_edittour.php?tourid=".$tour['tourid']."\">" . vbdate($vbulletin->options['dateformat'], $tour['tourdate']) . "</a>", 
        $tour['artisttitle'], 
        "<a href=\"erc_editvenue.php?venueid=".$tour['tourvenueid']."\">".$tour['venuetitle']."</a>",
        $tour['venuecitystate'], 
        $tour['tourid'], 
        $tour['tourstatus'],
        "<input type=\"radio\" name=\"idforaction\" value=\"" . $tour['tourid'] . "\">
    "));
} 


Any idea what i could be doing wrong? I was looking at announcement.php and the date is formatted in the same manner (i think) as i am trying, but i must be missing something...