sorting multidemensional array by date element

[slick101]

I have an multidimensional array which i would like to sort it by newest date, any ideas on doing this? sort? usort?

my array current looks something like this:

Array
(
    [0] => Array
        (
            [comment] => ;l;lk;lk;
            [date] => 2009-01-22 14:10:26
        )

[1] => Array
    (
        [comment] => TEST
        [date] => 2009-01-23 13:37:05
    )
)

[Installer]

function my_sort($val_1, $val_2)
{
    return strcmp($val_2['date'], $val_1['date']);
}
usort($arr, 'my_sort');

or

foreach ($arr as $key => $val) {
    $tmp[$key] = $val['date'];
}
array_multisort($tmp, SORT_DESC, $arr);