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I'm trying to sort the posts (in the edit screen (wp-admin/edit.php)) by meta value corresponding to an event date but I can't get it to work properly...

For example, ASC returns:

2012/10/12
2012/12/11
2012/09/7

and DESC returns:

2012/09/7
2012/12/11
2012/10/12

I'm using the following functions to create the sortable custom columns:

function event_date_column_display( $name ) {
    global $post;
    switch ($name) {
        case 'event-date':
            $pid = $post->ID;
            $event_date = get_post_meta($pid, '_event_date', TRUE);

            if ($event_date) {
                echo $event_date;
            }
    }
}

function event_date_column_register_sortable( $columns ) {
    $columns['event-date'] = 'event-date';  
    return $columns;
}

Any hint on how to fix this?

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Is it not an option to insert the sorting directly to the WP_Query class? It has all the parameters for handling this kind of situation http://codex.wordpress.org/Class_Reference/WP_Query#Custom_Field_Parameters

If you want to do that in the code, you can first validate all the dates, then convert them to the standard ISO(yyyy-mm-dd) format & then use the standard php functions to sort them like sort, ksort, (usort combined with strcmp) or any other depending on your data

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