WP Query between posts custom fields [duplicate]

Problem solved,
I’ve used this:

$d=new WP_Query(
    array(
        'category__in' => array(4),
        'post_type' => 'post',
        'posts_per_page' => '-1',
        'orderby' => 'meta_value',
        'order' => 'ASC',
        'meta_query' => array(
            'relation' => 'AND',
            array(
                'key' => 'data',
                'value' => $t,
                'compare' => '<='
            ),
            array(
                'key' => 'data',
                'value' => $o,
                'compare' => '>='
            )
        ),
    )
);

Instead of the other one before, and everything is working fine.