Query wp-types with Date

I want to compare the dates from my custom post type (created with wp-types) in my WordPress query.

On my localhost it looked like everything was working; but now on my live server it isn’t.
The query looks like this:

$today = time();
    $args = array(
        'post_type' => 'films',
        'posts_per_page' => 6,
        'meta_query' => array(
            array(
                'key' => 'wpcf-vanaf-in-het-theater',
                'value' => $today,
                'compare' => '<=',
                'type' => 'NUMERIC'
            ),
            array(
                'key' => 'wpcf-archiveren',
                'value' => '',
                'compare' => '=='
            )
        )
    );

What’s going wrong?