How can I query all users who registered today?

Question

I'm trying to use meta_query to return all users that have registered today :

$args = array(
    'meta_query' => array(
        array(
            'key' => 'user_registered',
            'value' => date('Y-m-d'),
            'compare' => '=',
            'type' => 'DATE'
        )
    )
);

$query = new WP_User_Query( $args );
$users = $query->get_results();

This doesn't seem to work though. What am I missing ?

Answer 1

The field user_registered is not a in the *_usermeta table, but the in *_users.

Nor do there seem to be any appropriate hooks to alter the SQL statement when using WP_User_Query. It seems you will need to use a direct SQL statement.

Another (minor) complication is that the registered date is stored as a date-time.

function wpse51485_get_users_registered_on( $date='' ){
    global $wpdb;

    if( empty($date) )
        $date = date('Y-m-d');

    $morning = new DateTime($date. ' 00:00:00');
    $night = new DateTime($date.' 23:59:59'); 
    $m = $morning->format('Y-m-d H:i:s');
    $n = $night->format('Y-m-d H:i:s');

    $sql = $wpdb->prepare("SELECT wp_users.* FROM wp_users WHERE 1=1 AND CAST(user_registered AS DATE) BETWEEN %s AND %s ORDER BY user_login ASC",$m,$n);

    $users = $wpdb->get_results($sql);

    return $users;
 }